feat(mobile) duplicated asset upload handling mechanism (#853)

2025-11-03 19:17:11 -05:00 · 2022-10-25 09:51:03 -05:00 · 2022-10-25 09:51:03 -05:00 · 6159c83fd2
commit 6159c83fd2
parent f1af17bf4d
32 changed files with 836 additions and 38 deletions
--- a/mobile/assets/i18n/de-DE.json
+++ b/mobile/assets/i18n/de-DE.json
@ -24,6 +24,7 @@
  "backup_controller_page_backup_selected": "Ausgewählt: ",
  "backup_controller_page_backup_sub": "Gesicherte Fotos und Videos",
  "backup_controller_page_cancel": "Abbrechen",
+  "backup_background_service_default_notification": "Suche nach neuen assets…",
  "backup_controller_page_created": "Erstellt: {}",
  "backup_controller_page_desc_backup": "Aktiviere die Sicherung um Elemente automatisch auf den Server zu laden.",
  "backup_controller_page_excluded": "Ausgeschlossen: ",
@ -123,4 +124,4 @@
  "version_announcement_overlay_text_2": "Bitte nehm dir die Zeit und lese das ",
  "version_announcement_overlay_text_3": " und achte darauf, dass deine docker-compose und .env Dateien aktuell sind, vor allem wenn du ein System für automatische Updates benutzt (z.B. Watchtower).",
  "version_announcement_overlay_title": "Neue Server-Version verfügbar \uD83C\uDF89"
-}
+}
--- a/mobile/lib/constants/hive_box.dart
+++ b/mobile/lib/constants/hive_box.dart
@ -25,3 +25,7 @@ const String backgroundBackupInfoBox = "immichBackgroundBackupInfoBox"; // Box
 const String backupFailedSince = "immichBackupFailedSince"; // Key 1
 const String backupRequireWifi = "immichBackupRequireWifi"; // Key 2
 const String backupRequireCharging = "immichBackupRequireCharging"; // Key 3
+
+// Duplicate asset
+const String duplicatedAssetsBox = "immichDuplicatedAssetsBox"; // Box
+const String duplicatedAssetsKey = "immichDuplicatedAssetsKey"; // Key 1
--- a/mobile/lib/main.dart
+++ b/mobile/lib/main.dart
@ -10,6 +10,7 @@ import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:immich_mobile/constants/locales.dart';
 import 'package:immich_mobile/modules/backup/background_service/background.service.dart';
 import 'package:immich_mobile/modules/backup/models/hive_backup_albums.model.dart';
+import 'package:immich_mobile/modules/backup/models/hive_duplicated_assets.model.dart';
 import 'package:immich_mobile/modules/backup/providers/backup.provider.dart';
 import 'package:immich_mobile/modules/login/models/hive_saved_login_info.model.dart';
 import 'package:immich_mobile/modules/login/providers/authentication.provider.dart';
@ -30,12 +31,14 @@ void main() async {

  Hive.registerAdapter(HiveSavedLoginInfoAdapter());
  Hive.registerAdapter(HiveBackupAlbumsAdapter());
+  Hive.registerAdapter(HiveDuplicatedAssetsAdapter());

  await Hive.openBox(userInfoBox);
  await Hive.openBox<HiveSavedLoginInfo>(hiveLoginInfoBox);
  await Hive.openBox<HiveBackupAlbums>(hiveBackupInfoBox);
  await Hive.openBox(hiveGithubReleaseInfoBox);
  await Hive.openBox(userSettingInfoBox);
+  await Hive.openBox<HiveDuplicatedAssets>(duplicatedAssetsBox);

  SystemChrome.setSystemUIOverlayStyle(
    const SystemUiOverlayStyle(
--- a/mobile/lib/modules/backup/background_service/background.service.dart
+++ b/mobile/lib/modules/backup/background_service/background.service.dart
@ -14,6 +14,7 @@ import 'package:immich_mobile/modules/backup/background_service/localization.dar
 import 'package:immich_mobile/modules/backup/models/current_upload_asset.model.dart';
 import 'package:immich_mobile/modules/backup/models/error_upload_asset.model.dart';
 import 'package:immich_mobile/modules/backup/models/hive_backup_albums.model.dart';
+import 'package:immich_mobile/modules/backup/models/hive_duplicated_assets.model.dart';
 import 'package:immich_mobile/modules/backup/services/backup.service.dart';
 import 'package:immich_mobile/modules/login/models/hive_saved_login_info.model.dart';
 import 'package:immich_mobile/modules/settings/services/app_settings.service.dart';
@ -316,10 +317,13 @@ class BackgroundService {

    Hive.registerAdapter(HiveSavedLoginInfoAdapter());
    Hive.registerAdapter(HiveBackupAlbumsAdapter());
+    Hive.registerAdapter(HiveDuplicatedAssetsAdapter());
+
    await Hive.openBox(userInfoBox);
    await Hive.openBox<HiveSavedLoginInfo>(hiveLoginInfoBox);
    await Hive.openBox(userSettingInfoBox);
    await Hive.openBox(backgroundBackupInfoBox);
+    await Hive.openBox<HiveDuplicatedAssets>(duplicatedAssetsBox);

    ApiService apiService = ApiService();
    apiService.setEndpoint(Hive.box(userInfoBox).get(serverEndpointKey));
@ -410,7 +414,7 @@ class BackgroundService {
    final bool ok = await backupService.backupAsset(
      toUpload,
      _cancellationToken!,
-      notifyTotalProgress ? _onAssetUploaded : (assetId, deviceId) {},
+      notifyTotalProgress ? _onAssetUploaded : (assetId, deviceId, isDup) {},
      notifySingleProgress ? _onProgress : (sent, total) {},
      notifySingleProgress ? _onSetCurrentBackupAsset : (asset) {},
      _onBackupError,
@ -429,7 +433,7 @@ class BackgroundService {
    return "$percent% ($_uploadedAssetsCount/$_assetsToUploadCount)";
  }

-  void _onAssetUploaded(String deviceAssetId, String deviceId) {
+  void _onAssetUploaded(String deviceAssetId, String deviceId, bool isDup) {
    debugPrint("Uploaded $deviceAssetId from $deviceId");
    _uploadedAssetsCount++;
    _updateNotification(
--- a/mobile/lib/modules/backup/models/error_upload_asset.model.dart
+++ b/mobile/lib/modules/backup/models/error_upload_asset.model.dart
@ -45,8 +45,10 @@ class ErrorUploadAsset extends Equatable {
  List<Object> get props {
    return [
      id,
+      createdAt,
      fileName,
      fileType,
+      asset,
      errorMessage,
    ];
  }
--- a/mobile/lib/modules/backup/models/hive_duplicated_assets.model.dart
+++ b/mobile/lib/modules/backup/models/hive_duplicated_assets.model.dart
@ -0,0 +1,57 @@
+import 'dart:convert';
+
+import 'package:collection/collection.dart';
+import 'package:hive/hive.dart';
+
+part 'hive_duplicated_assets.model.g.dart';
+
+@HiveType(typeId: 2)
+class HiveDuplicatedAssets {
+  @HiveField(0, defaultValue: [])
+  List<String> duplicatedAssetIds;
+
+  HiveDuplicatedAssets({
+    required this.duplicatedAssetIds,
+  });
+
+  HiveDuplicatedAssets copyWith({
+    List<String>? duplicatedAssetIds,
+  }) {
+    return HiveDuplicatedAssets(
+      duplicatedAssetIds: duplicatedAssetIds ?? this.duplicatedAssetIds,
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return {
+      'duplicatedAssetIds': duplicatedAssetIds,
+    };
+  }
+
+  factory HiveDuplicatedAssets.fromMap(Map<String, dynamic> map) {
+    return HiveDuplicatedAssets(
+      duplicatedAssetIds: List<String>.from(map['duplicatedAssetIds']),
+    );
+  }
+
+  String toJson() => json.encode(toMap());
+
+  factory HiveDuplicatedAssets.fromJson(String source) =>
+      HiveDuplicatedAssets.fromMap(json.decode(source));
+
+  @override
+  String toString() =>
+      'HiveDuplicatedAssets(duplicatedAssetIds: $duplicatedAssetIds)';
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+    final listEquals = const DeepCollectionEquality().equals;
+
+    return other is HiveDuplicatedAssets &&
+        listEquals(other.duplicatedAssetIds, duplicatedAssetIds);
+  }
+
+  @override
+  int get hashCode => duplicatedAssetIds.hashCode;
+}
--- a/mobile/lib/modules/backup/models/hive_duplicated_assets.model.g.dart
+++ b/mobile/lib/modules/backup/models/hive_duplicated_assets.model.g.dart
@ -0,0 +1,42 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'hive_duplicated_assets.model.dart';
+
+// **************************************************************************
+// TypeAdapterGenerator
+// **************************************************************************
+
+class HiveDuplicatedAssetsAdapter extends TypeAdapter<HiveDuplicatedAssets> {
+  @override
+  final int typeId = 2;
+
+  @override
+  HiveDuplicatedAssets read(BinaryReader reader) {
+    final numOfFields = reader.readByte();
+    final fields = <int, dynamic>{
+      for (int i = 0; i < numOfFields; i++) reader.readByte(): reader.read(),
+    };
+    return HiveDuplicatedAssets(
+      duplicatedAssetIds:
+          fields[0] == null ? [] : (fields[0] as List).cast<String>(),
+    );
+  }
+
+  @override
+  void write(BinaryWriter writer, HiveDuplicatedAssets obj) {
+    writer
+      ..writeByte(1)
+      ..writeByte(0)
+      ..write(obj.duplicatedAssetIds);
+  }
+
+  @override
+  int get hashCode => typeId.hashCode;
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is HiveDuplicatedAssetsAdapter &&
+          runtimeType == other.runtimeType &&
+          typeId == other.typeId;
+}
--- a/mobile/lib/modules/backup/providers/backup.provider.dart
+++ b/mobile/lib/modules/backup/providers/backup.provider.dart
@ -10,6 +10,7 @@ import 'package:immich_mobile/modules/backup/models/backup_state.model.dart';
 import 'package:immich_mobile/modules/backup/models/current_upload_asset.model.dart';
 import 'package:immich_mobile/modules/backup/models/error_upload_asset.model.dart';
 import 'package:immich_mobile/modules/backup/models/hive_backup_albums.model.dart';
+import 'package:immich_mobile/modules/backup/models/hive_duplicated_assets.model.dart';
 import 'package:immich_mobile/modules/backup/providers/error_backup_list.provider.dart';
 import 'package:immich_mobile/modules/backup/background_service/background.service.dart';
 import 'package:immich_mobile/modules/backup/services/backup.service.dart';
@ -296,6 +297,7 @@ class BackupNotifier extends StateNotifier<BackUpState> {
  /// Those assets are unique and are used as the total assets
  ///
  Future<void> _updateBackupAssetCount() async {
+    Set<String> duplicatedAssetIds = _backupService.getDuplicatedAssetIds();
    Set<AssetEntity> assetsFromSelectedAlbums = {};
    Set<AssetEntity> assetsFromExcludedAlbums = {};

@ -326,9 +328,15 @@ class BackupNotifier extends StateNotifier<BackUpState> {
    // Find asset that were backup from selected albums
    Set<String> selectedAlbumsBackupAssets =
        Set.from(allUniqueAssets.map((e) => e.id));
+
    selectedAlbumsBackupAssets
        .removeWhere((assetId) => !allAssetsInDatabase.contains(assetId));

+    // Remove duplicated asset from all unique assets
+    allUniqueAssets.removeWhere(
+      (asset) => duplicatedAssetIds.contains(asset.id),
+    );
+
    if (allUniqueAssets.isEmpty) {
      debugPrint("No Asset On Device");
      state = state.copyWith(
@ -455,14 +463,26 @@ class BackupNotifier extends StateNotifier<BackUpState> {
    );
  }

-  void _onAssetUploaded(String deviceAssetId, String deviceId) {
-    state = state.copyWith(
-      selectedAlbumsBackupAssetsIds: {
-        ...state.selectedAlbumsBackupAssetsIds,
-        deviceAssetId
-      },
-      allAssetsInDatabase: [...state.allAssetsInDatabase, deviceAssetId],
-    );
+  void _onAssetUploaded(
+    String deviceAssetId,
+    String deviceId,
+    bool isDuplicated,
+  ) {
+    if (isDuplicated) {
+      state = state.copyWith(
+        allUniqueAssets: state.allUniqueAssets
+            .where((asset) => asset.id != deviceAssetId)
+            .toSet(),
+      );
+    } else {
+      state = state.copyWith(
+        selectedAlbumsBackupAssetsIds: {
+          ...state.selectedAlbumsBackupAssetsIds,
+          deviceAssetId
+        },
+        allAssetsInDatabase: [...state.allAssetsInDatabase, deviceAssetId],
+      );
+    }

    if (state.allUniqueAssets.length -
            state.selectedAlbumsBackupAssetsIds.length ==
@ -564,6 +584,7 @@ class BackupNotifier extends StateNotifier<BackUpState> {
          albums.lastExcludedBackupTime,
        );
      }
+      await Hive.openBox<HiveDuplicatedAssets>(duplicatedAssetsBox);
      final Box backgroundBox = await Hive.openBox(backgroundBackupInfoBox);
      state = state.copyWith(
        backupProgress: previous,
@ -608,6 +629,13 @@ class BackupNotifier extends StateNotifier<BackUpState> {
      } catch (error) {
        debugPrint("[_notifyBackgroundServiceCanRun] failed to close box");
      }
+      try {
+        if (Hive.isBoxOpen(duplicatedAssetsBox)) {
+          await Hive.box<HiveDuplicatedAssets>(duplicatedAssetsBox).close();
+        }
+      } catch (error) {
+        debugPrint("[_notifyBackgroundServiceCanRun] failed to close box");
+      }
      try {
        if (Hive.isBoxOpen(backgroundBackupInfoBox)) {
          await Hive.box(backgroundBackupInfoBox).close();
--- a/mobile/lib/modules/backup/services/backup.service.dart
+++ b/mobile/lib/modules/backup/services/backup.service.dart
@ -19,6 +19,8 @@ import 'package:http_parser/http_parser.dart';
 import 'package:path/path.dart' as p;
 import 'package:cancellation_token_http/http.dart' as http;

+import '../models/hive_duplicated_assets.model.dart';
+
 final backupServiceProvider = Provider(
  (ref) => BackupService(
    ref.watch(apiServiceProvider),
@ -41,6 +43,29 @@ class BackupService {
    }
  }

+  void _saveDuplicatedAssetIdToLocalStorage(List<String> deviceAssetIds) {
+    HiveDuplicatedAssets duplicatedAssets =
+        Hive.box<HiveDuplicatedAssets>(duplicatedAssetsBox)
+                .get(duplicatedAssetsKey) ??
+            HiveDuplicatedAssets(duplicatedAssetIds: []);
+
+    duplicatedAssets.duplicatedAssetIds =
+        {...duplicatedAssets.duplicatedAssetIds, ...deviceAssetIds}.toList();
+
+    Hive.box<HiveDuplicatedAssets>(duplicatedAssetsBox)
+        .put(duplicatedAssetsKey, duplicatedAssets);
+  }
+
+  /// Get duplicated asset id from Hive storage
+  Set<String> getDuplicatedAssetIds() {
+    HiveDuplicatedAssets duplicatedAssets =
+        Hive.box<HiveDuplicatedAssets>(duplicatedAssetsBox)
+                .get(duplicatedAssetsKey) ??
+            HiveDuplicatedAssets(duplicatedAssetIds: []);
+
+    return duplicatedAssets.duplicatedAssetIds.toSet();
+  }
+
  /// Returns all assets newer than the last successful backup per album
  Future<List<AssetEntity>> buildUploadCandidates(
    HiveBackupAlbums backupAlbums,
@ -140,34 +165,47 @@ class BackupService {
  Future<List<AssetEntity>> removeAlreadyUploadedAssets(
    List<AssetEntity> candidates,
  ) async {
-    final String deviceId = Hive.box(userInfoBox).get(deviceIdKey);
-    if (candidates.length < 10) {
-      final List<CheckDuplicateAssetResponseDto?> duplicateResponse =
-          await Future.wait(
-        candidates.map(
-          (e) => _apiService.assetApi.checkDuplicateAsset(
-            CheckDuplicateAssetDto(deviceAssetId: e.id, deviceId: deviceId),
-          ),
+    if (candidates.isEmpty) {
+      return candidates;
+    }
+    final Set<String> duplicatedAssetIds = getDuplicatedAssetIds();
+    candidates = duplicatedAssetIds.isEmpty
+        ? candidates
+        : candidates
+            .whereNot((asset) => duplicatedAssetIds.contains(asset.id))
+            .toList();
+    if (candidates.isEmpty) {
+      return candidates;
+    }
+    final Set<String> existing = {};
+    try {
+      final String deviceId = Hive.box(userInfoBox).get(deviceIdKey);
+      final CheckExistingAssetsResponseDto? duplicates =
+          await _apiService.assetApi.checkExistingAssets(
+        CheckExistingAssetsDto(
+          deviceAssetIds: candidates.map((e) => e.id).toList(),
+          deviceId: deviceId,
        ),
      );
-      return candidates
-          .whereIndexed((i, e) => duplicateResponse[i]?.isExist == false)
-          .toList();
-    } else {
-      final List<String>? allAssetsInDatabase = await getDeviceBackupAsset();
-
-      if (allAssetsInDatabase == null) {
-        return candidates;
+      if (duplicates != null) {
+        existing.addAll(duplicates.existingIds);
+      }
+    } on ApiException {
+      // workaround for older server versions or when checking for too many assets at once
+      final List<String>? allAssetsInDatabase = await getDeviceBackupAsset();
+      if (allAssetsInDatabase != null) {
+        existing.addAll(allAssetsInDatabase);
      }
-      final Set<String> inDb = allAssetsInDatabase.toSet();
-      return candidates.whereNot((e) => inDb.contains(e.id)).toList();
    }
+    return existing.isEmpty
+        ? candidates
+        : candidates.whereNot((e) => existing.contains(e.id)).toList();
  }

  Future<bool> backupAsset(
    Iterable<AssetEntity> assetList,
    http.CancellationToken cancelToken,
-    Function(String, String) singleAssetDoneCb,
+    Function(String, String, bool) uploadSuccessCb,
    Function(int, int) uploadProgressCb,
    Function(CurrentUploadAsset) setCurrentUploadAssetCb,
    Function(ErrorUploadAsset) errorCb,
@ -176,6 +214,7 @@ class BackupService {
    String savedEndpoint = Hive.box(userInfoBox).get(serverEndpointKey);
    File? file;
    bool anyErrors = false;
+    final List<String> duplicatedAssetIds = [];

    for (var entity in assetList) {
      try {
@ -235,8 +274,13 @@ class BackupService {

          var response = await req.send(cancellationToken: cancelToken);

-          if (response.statusCode == 201) {
-            singleAssetDoneCb(entity.id, deviceId);
+          if (response.statusCode == 200) {
+            // asset is a duplicate (already exists on the server)
+            duplicatedAssetIds.add(entity.id);
+            uploadSuccessCb(entity.id, deviceId, true);
+          } else if (response.statusCode == 201) {
+            // stored a new asset on the server
+            uploadSuccessCb(entity.id, deviceId, false);
          } else {
            var data = await response.stream.bytesToString();
            var error = jsonDecode(data);
@ -260,7 +304,8 @@ class BackupService {
        }
      } on http.CancelledException {
        debugPrint("Backup was cancelled by the user");
-        return false;
+        anyErrors = true;
+        break;
      } catch (e) {
        debugPrint("ERROR backupAsset: ${e.toString()}");
        anyErrors = true;
@ -271,6 +316,9 @@ class BackupService {
        }
      }
    }
+    if (duplicatedAssetIds.isNotEmpty) {
+      _saveDuplicatedAssetIdToLocalStorage(duplicatedAssetIds);
+    }
    return !anyErrors;
  }

--- a/mobile/lib/modules/backup/views/backup_controller_page.dart
+++ b/mobile/lib/modules/backup/views/backup_controller_page.dart
@ -419,7 +419,6 @@ class BackupControllerPage extends HookConsumerWidget {
              ActionChip(
                avatar: Icon(
                  Icons.info,
-                  size: 24,
                  color: Colors.red[400],
                ),
                elevation: 1,
--- a/mobile/openapi/.openapi-generator/FILES
+++ b/mobile/openapi/.openapi-generator/FILES
@ -19,6 +19,8 @@ doc/AssetTypeEnum.md
 doc/AuthenticationApi.md
 doc/CheckDuplicateAssetDto.md
 doc/CheckDuplicateAssetResponseDto.md
+doc/CheckExistingAssetsDto.md
+doc/CheckExistingAssetsResponseDto.md
 doc/CreateAlbumDto.md
 doc/CreateDeviceInfoDto.md
 doc/CreateProfileImageResponseDto.md
@ -93,6 +95,8 @@ lib/model/asset_response_dto.dart
 lib/model/asset_type_enum.dart
 lib/model/check_duplicate_asset_dto.dart
 lib/model/check_duplicate_asset_response_dto.dart
+lib/model/check_existing_assets_dto.dart
+lib/model/check_existing_assets_response_dto.dart
 lib/model/create_album_dto.dart
 lib/model/create_device_info_dto.dart
 lib/model/create_profile_image_response_dto.dart
@ -133,3 +137,5 @@ lib/model/user_count_response_dto.dart
 lib/model/user_response_dto.dart
 lib/model/validate_access_token_response_dto.dart
 pubspec.yaml
+test/check_existing_assets_dto_test.dart
+test/check_existing_assets_response_dto_test.dart
--- a/mobile/openapi/README.md
+++ b/mobile/openapi/README.md
@ -76,6 +76,7 @@ Class | Method | HTTP request | Description
 *AlbumApi* | [**removeUserFromAlbum**](doc//AlbumApi.md#removeuserfromalbum) | **DELETE** /album/{albumId}/user/{userId} | 
 *AlbumApi* | [**updateAlbumInfo**](doc//AlbumApi.md#updatealbuminfo) | **PATCH** /album/{albumId} | 
 *AssetApi* | [**checkDuplicateAsset**](doc//AssetApi.md#checkduplicateasset) | **POST** /asset/check | 
+*AssetApi* | [**checkExistingAssets**](doc//AssetApi.md#checkexistingassets) | **POST** /asset/exist | 
 *AssetApi* | [**deleteAsset**](doc//AssetApi.md#deleteasset) | **DELETE** /asset | 
 *AssetApi* | [**downloadFile**](doc//AssetApi.md#downloadfile) | **GET** /asset/download | 
 *AssetApi* | [**getAllAssets**](doc//AssetApi.md#getallassets) | **GET** /asset | 
@ -130,6 +131,8 @@ Class | Method | HTTP request | Description
 - [AssetTypeEnum](doc//AssetTypeEnum.md)
 - [CheckDuplicateAssetDto](doc//CheckDuplicateAssetDto.md)
 - [CheckDuplicateAssetResponseDto](doc//CheckDuplicateAssetResponseDto.md)
+ - [CheckExistingAssetsDto](doc//CheckExistingAssetsDto.md)
+ - [CheckExistingAssetsResponseDto](doc//CheckExistingAssetsResponseDto.md)
 - [CreateAlbumDto](doc//CreateAlbumDto.md)
 - [CreateDeviceInfoDto](doc//CreateDeviceInfoDto.md)
 - [CreateProfileImageResponseDto](doc//CreateProfileImageResponseDto.md)
--- a/mobile/openapi/doc/AssetApi.md
+++ b/mobile/openapi/doc/AssetApi.md
@ -10,6 +10,7 @@ All URIs are relative to */api*
 Method | HTTP request | Description
 ------------- | ------------- | -------------
 [**checkDuplicateAsset**](AssetApi.md#checkduplicateasset) | **POST** /asset/check | 
+[**checkExistingAssets**](AssetApi.md#checkexistingassets) | **POST** /asset/exist | 
 [**deleteAsset**](AssetApi.md#deleteasset) | **DELETE** /asset | 
 [**downloadFile**](AssetApi.md#downloadfile) | **GET** /asset/download | 
 [**getAllAssets**](AssetApi.md#getallassets) | **GET** /asset | 
@ -76,6 +77,55 @@ Name | Type | Description  | Notes

 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)

+# **checkExistingAssets**
+> CheckExistingAssetsResponseDto checkExistingAssets(checkExistingAssetsDto)
+
+
+
+Checks if multiple assets exist on the server and returns all existing - used by background backup
+
+### Example
+```dart
+import 'package:openapi/api.dart';
+// TODO Configure HTTP Bearer authorization: bearer
+// Case 1. Use String Token
+//defaultApiClient.getAuthentication<HttpBearerAuth>('bearer').setAccessToken('YOUR_ACCESS_TOKEN');
+// Case 2. Use Function which generate token.
+// String yourTokenGeneratorFunction() { ... }
+//defaultApiClient.getAuthentication<HttpBearerAuth>('bearer').setAccessToken(yourTokenGeneratorFunction);
+
+final api_instance = AssetApi();
+final checkExistingAssetsDto = CheckExistingAssetsDto(); // CheckExistingAssetsDto | 
+
+try {
+    final result = api_instance.checkExistingAssets(checkExistingAssetsDto);
+    print(result);
+} catch (e) {
+    print('Exception when calling AssetApi->checkExistingAssets: $e\n');
+}
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **checkExistingAssetsDto** | [**CheckExistingAssetsDto**](CheckExistingAssetsDto.md)|  | 
+
+### Return type
+
+[**CheckExistingAssetsResponseDto**](CheckExistingAssetsResponseDto.md)
+
+### Authorization
+
+[bearer](../README.md#bearer)
+
+### HTTP request headers
+
+ - **Content-Type**: application/json
+ - **Accept**: application/json
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
 # **deleteAsset**
 > List<DeleteAssetResponseDto> deleteAsset(deleteAssetDto)

--- a/mobile/openapi/doc/CheckExistingAssetsDto.md
+++ b/mobile/openapi/doc/CheckExistingAssetsDto.md
@ -0,0 +1,16 @@
+# openapi.model.CheckExistingAssetsDto
+
+## Load the model package
+```dart
+import 'package:openapi/api.dart';
+```
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**deviceAssetIds** | **List<String>** |  | [default to const []]
+**deviceId** | **String** |  | 
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+
--- a/mobile/openapi/doc/CheckExistingAssetsResponseDto.md
+++ b/mobile/openapi/doc/CheckExistingAssetsResponseDto.md
@ -0,0 +1,15 @@
+# openapi.model.CheckExistingAssetsResponseDto
+
+## Load the model package
+```dart
+import 'package:openapi/api.dart';
+```
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**existingIds** | **List<String>** |  | [default to const []]
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+
--- a/mobile/openapi/lib/api.dart
+++ b/mobile/openapi/lib/api.dart
@ -49,6 +49,8 @@ part 'model/asset_response_dto.dart';
 part 'model/asset_type_enum.dart';
 part 'model/check_duplicate_asset_dto.dart';
 part 'model/check_duplicate_asset_response_dto.dart';
+part 'model/check_existing_assets_dto.dart';
+part 'model/check_existing_assets_response_dto.dart';
 part 'model/create_album_dto.dart';
 part 'model/create_device_info_dto.dart';
 part 'model/create_profile_image_response_dto.dart';
--- a/mobile/openapi/lib/api/asset_api.dart
+++ b/mobile/openapi/lib/api/asset_api.dart
@ -72,6 +72,62 @@ class AssetApi {
    return null;
  }

+  /// 
+  ///
+  /// Checks if multiple assets exist on the server and returns all existing - used by background backup
+  ///
+  /// Note: This method returns the HTTP [Response].
+  ///
+  /// Parameters:
+  ///
+  /// * [CheckExistingAssetsDto] checkExistingAssetsDto (required):
+  Future<Response> checkExistingAssetsWithHttpInfo(CheckExistingAssetsDto checkExistingAssetsDto,) async {
+    // ignore: prefer_const_declarations
+    final path = r'/asset/exist';
+
+    // ignore: prefer_final_locals
+    Object? postBody = checkExistingAssetsDto;
+
+    final queryParams = <QueryParam>[];
+    final headerParams = <String, String>{};
+    final formParams = <String, String>{};
+
+    const contentTypes = <String>['application/json'];
+
+
+    return apiClient.invokeAPI(
+      path,
+      'POST',
+      queryParams,
+      postBody,
+      headerParams,
+      formParams,
+      contentTypes.isEmpty ? null : contentTypes.first,
+    );
+  }
+
+  /// 
+  ///
+  /// Checks if multiple assets exist on the server and returns all existing - used by background backup
+  ///
+  /// Parameters:
+  ///
+  /// * [CheckExistingAssetsDto] checkExistingAssetsDto (required):
+  Future<CheckExistingAssetsResponseDto?> checkExistingAssets(CheckExistingAssetsDto checkExistingAssetsDto,) async {
+    final response = await checkExistingAssetsWithHttpInfo(checkExistingAssetsDto,);
+    if (response.statusCode >= HttpStatus.badRequest) {
+      throw ApiException(response.statusCode, await _decodeBodyBytes(response));
+    }
+    // When a remote server returns no body with a status of 204, we shall not decode it.
+    // At the time of writing this, `dart:convert` will throw an "Unexpected end of input"
+    // FormatException when trying to decode an empty string.
+    if (response.body.isNotEmpty && response.statusCode != HttpStatus.noContent) {
+      return await apiClient.deserializeAsync(await _decodeBodyBytes(response), 'CheckExistingAssetsResponseDto',) as CheckExistingAssetsResponseDto;
+    
+    }
+    return null;
+  }
+
  /// Performs an HTTP 'DELETE /asset' operation and returns the [Response].
  /// Parameters:
  ///
--- a/mobile/openapi/lib/api_client.dart
+++ b/mobile/openapi/lib/api_client.dart
@ -220,6 +220,10 @@ class ApiClient {
          return CheckDuplicateAssetDto.fromJson(value);
        case 'CheckDuplicateAssetResponseDto':
          return CheckDuplicateAssetResponseDto.fromJson(value);
+        case 'CheckExistingAssetsDto':
+          return CheckExistingAssetsDto.fromJson(value);
+        case 'CheckExistingAssetsResponseDto':
+          return CheckExistingAssetsResponseDto.fromJson(value);
        case 'CreateAlbumDto':
          return CreateAlbumDto.fromJson(value);
        case 'CreateDeviceInfoDto':
--- a/mobile/openapi/lib/model/check_existing_assets_dto.dart
+++ b/mobile/openapi/lib/model/check_existing_assets_dto.dart
@ -0,0 +1,121 @@
+//
+// AUTO-GENERATED FILE, DO NOT MODIFY!
+//
+// @dart=2.12
+
+// ignore_for_file: unused_element, unused_import
+// ignore_for_file: always_put_required_named_parameters_first
+// ignore_for_file: constant_identifier_names
+// ignore_for_file: lines_longer_than_80_chars
+
+part of openapi.api;
+
+class CheckExistingAssetsDto {
+  /// Returns a new [CheckExistingAssetsDto] instance.
+  CheckExistingAssetsDto({
+    this.deviceAssetIds = const [],
+    required this.deviceId,
+  });
+
+  List<String> deviceAssetIds;
+
+  String deviceId;
+
+  @override
+  bool operator ==(Object other) => identical(this, other) || other is CheckExistingAssetsDto &&
+     other.deviceAssetIds == deviceAssetIds &&
+     other.deviceId == deviceId;
+
+  @override
+  int get hashCode =>
+    // ignore: unnecessary_parenthesis
+    (deviceAssetIds.hashCode) +
+    (deviceId.hashCode);
+
+  @override
+  String toString() => 'CheckExistingAssetsDto[deviceAssetIds=$deviceAssetIds, deviceId=$deviceId]';
+
+  Map<String, dynamic> toJson() {
+    final _json = <String, dynamic>{};
+      _json[r'deviceAssetIds'] = deviceAssetIds;
+      _json[r'deviceId'] = deviceId;
+    return _json;
+  }
+
+  /// Returns a new [CheckExistingAssetsDto] instance and imports its values from
+  /// [value] if it's a [Map], null otherwise.
+  // ignore: prefer_constructors_over_static_methods
+  static CheckExistingAssetsDto? fromJson(dynamic value) {
+    if (value is Map) {
+      final json = value.cast<String, dynamic>();
+
+      // Ensure that the map contains the required keys.
+      // Note 1: the values aren't checked for validity beyond being non-null.
+      // Note 2: this code is stripped in release mode!
+      assert(() {
+        requiredKeys.forEach((key) {
+          assert(json.containsKey(key), 'Required key "CheckExistingAssetsDto[$key]" is missing from JSON.');
+          assert(json[key] != null, 'Required key "CheckExistingAssetsDto[$key]" has a null value in JSON.');
+        });
+        return true;
+      }());
+
+      return CheckExistingAssetsDto(
+        deviceAssetIds: json[r'deviceAssetIds'] is List
+            ? (json[r'deviceAssetIds'] as List).cast<String>()
+            : const [],
+        deviceId: mapValueOfType<String>(json, r'deviceId')!,
+      );
+    }
+    return null;
+  }
+
+  static List<CheckExistingAssetsDto>? listFromJson(dynamic json, {bool growable = false,}) {
+    final result = <CheckExistingAssetsDto>[];
+    if (json is List && json.isNotEmpty) {
+      for (final row in json) {
+        final value = CheckExistingAssetsDto.fromJson(row);
+        if (value != null) {
+          result.add(value);
+        }
+      }
+    }
+    return result.toList(growable: growable);
+  }
+
+  static Map<String, CheckExistingAssetsDto> mapFromJson(dynamic json) {
+    final map = <String, CheckExistingAssetsDto>{};
+    if (json is Map && json.isNotEmpty) {
+      json = json.cast<String, dynamic>(); // ignore: parameter_assignments
+      for (final entry in json.entries) {
+        final value = CheckExistingAssetsDto.fromJson(entry.value);
+        if (value != null) {
+          map[entry.key] = value;
+        }
+      }
+    }
+    return map;
+  }
+
+  // maps a json object with a list of CheckExistingAssetsDto-objects as value to a dart map
+  static Map<String, List<CheckExistingAssetsDto>> mapListFromJson(dynamic json, {bool growable = false,}) {
+    final map = <String, List<CheckExistingAssetsDto>>{};
+    if (json is Map && json.isNotEmpty) {
+      json = json.cast<String, dynamic>(); // ignore: parameter_assignments
+      for (final entry in json.entries) {
+        final value = CheckExistingAssetsDto.listFromJson(entry.value, growable: growable,);
+        if (value != null) {
+          map[entry.key] = value;
+        }
+      }
+    }
+    return map;
+  }
+
+  /// The list of required keys that must be present in a JSON.
+  static const requiredKeys = <String>{
+    'deviceAssetIds',
+    'deviceId',
+  };
+}
+
--- a/mobile/openapi/lib/model/check_existing_assets_response_dto.dart
+++ b/mobile/openapi/lib/model/check_existing_assets_response_dto.dart
@ -0,0 +1,113 @@
+//
+// AUTO-GENERATED FILE, DO NOT MODIFY!
+//
+// @dart=2.12
+
+// ignore_for_file: unused_element, unused_import
+// ignore_for_file: always_put_required_named_parameters_first
+// ignore_for_file: constant_identifier_names
+// ignore_for_file: lines_longer_than_80_chars
+
+part of openapi.api;
+
+class CheckExistingAssetsResponseDto {
+  /// Returns a new [CheckExistingAssetsResponseDto] instance.
+  CheckExistingAssetsResponseDto({
+    this.existingIds = const [],
+  });
+
+  List<String> existingIds;
+
+  @override
+  bool operator ==(Object other) => identical(this, other) || other is CheckExistingAssetsResponseDto &&
+     other.existingIds == existingIds;
+
+  @override
+  int get hashCode =>
+    // ignore: unnecessary_parenthesis
+    (existingIds.hashCode);
+
+  @override
+  String toString() => 'CheckExistingAssetsResponseDto[existingIds=$existingIds]';
+
+  Map<String, dynamic> toJson() {
+    final _json = <String, dynamic>{};
+      _json[r'existingIds'] = existingIds;
+    return _json;
+  }
+
+  /// Returns a new [CheckExistingAssetsResponseDto] instance and imports its values from
+  /// [value] if it's a [Map], null otherwise.
+  // ignore: prefer_constructors_over_static_methods
+  static CheckExistingAssetsResponseDto? fromJson(dynamic value) {
+    if (value is Map) {
+      final json = value.cast<String, dynamic>();
+
+      // Ensure that the map contains the required keys.
+      // Note 1: the values aren't checked for validity beyond being non-null.
+      // Note 2: this code is stripped in release mode!
+      assert(() {
+        requiredKeys.forEach((key) {
+          assert(json.containsKey(key), 'Required key "CheckExistingAssetsResponseDto[$key]" is missing from JSON.');
+          assert(json[key] != null, 'Required key "CheckExistingAssetsResponseDto[$key]" has a null value in JSON.');
+        });
+        return true;
+      }());
+
+      return CheckExistingAssetsResponseDto(
+        existingIds: json[r'existingIds'] is List
+            ? (json[r'existingIds'] as List).cast<String>()
+            : const [],
+      );
+    }
+    return null;
+  }
+
+  static List<CheckExistingAssetsResponseDto>? listFromJson(dynamic json, {bool growable = false,}) {
+    final result = <CheckExistingAssetsResponseDto>[];
+    if (json is List && json.isNotEmpty) {
+      for (final row in json) {
+        final value = CheckExistingAssetsResponseDto.fromJson(row);
+        if (value != null) {
+          result.add(value);
+        }
+      }
+    }
+    return result.toList(growable: growable);
+  }
+
+  static Map<String, CheckExistingAssetsResponseDto> mapFromJson(dynamic json) {
+    final map = <String, CheckExistingAssetsResponseDto>{};
+    if (json is Map && json.isNotEmpty) {
+      json = json.cast<String, dynamic>(); // ignore: parameter_assignments
+      for (final entry in json.entries) {
+        final value = CheckExistingAssetsResponseDto.fromJson(entry.value);
+        if (value != null) {
+          map[entry.key] = value;
+        }
+      }
+    }
+    return map;
+  }
+
+  // maps a json object with a list of CheckExistingAssetsResponseDto-objects as value to a dart map
+  static Map<String, List<CheckExistingAssetsResponseDto>> mapListFromJson(dynamic json, {bool growable = false,}) {
+    final map = <String, List<CheckExistingAssetsResponseDto>>{};
+    if (json is Map && json.isNotEmpty) {
+      json = json.cast<String, dynamic>(); // ignore: parameter_assignments
+      for (final entry in json.entries) {
+        final value = CheckExistingAssetsResponseDto.listFromJson(entry.value, growable: growable,);
+        if (value != null) {
+          map[entry.key] = value;
+        }
+      }
+    }
+    return map;
+  }
+
+  /// The list of required keys that must be present in a JSON.
+  static const requiredKeys = <String>{
+    'existingIds',
+  };
+}
+
--- a/mobile/openapi/test/check_existing_assets_dto_test.dart
+++ b/mobile/openapi/test/check_existing_assets_dto_test.dart
@ -0,0 +1,32 @@
+//
+// AUTO-GENERATED FILE, DO NOT MODIFY!
+//
+// @dart=2.12
+
+// ignore_for_file: unused_element, unused_import
+// ignore_for_file: always_put_required_named_parameters_first
+// ignore_for_file: constant_identifier_names
+// ignore_for_file: lines_longer_than_80_chars
+
+import 'package:openapi/api.dart';
+import 'package:test/test.dart';
+
+// tests for CheckExistingAssetsDto
+void main() {
+  // final instance = CheckExistingAssetsDto();
+
+  group('test CheckExistingAssetsDto', () {
+    // List<String> deviceAssetIds (default value: const [])
+    test('to test the property `deviceAssetIds`', () async {
+      // TODO
+    });
+
+    // String deviceId
+    test('to test the property `deviceId`', () async {
+      // TODO
+    });
+
+
+  });
+
+}
--- a/mobile/openapi/test/check_existing_assets_response_dto_test.dart
+++ b/mobile/openapi/test/check_existing_assets_response_dto_test.dart
@ -0,0 +1,27 @@
+//
+// AUTO-GENERATED FILE, DO NOT MODIFY!
+//
+// @dart=2.12
+
+// ignore_for_file: unused_element, unused_import
+// ignore_for_file: always_put_required_named_parameters_first
+// ignore_for_file: constant_identifier_names
+// ignore_for_file: lines_longer_than_80_chars
+
+import 'package:openapi/api.dart';
+import 'package:test/test.dart';
+
+// tests for CheckExistingAssetsResponseDto
+void main() {
+  // final instance = CheckExistingAssetsResponseDto();
+
+  group('test CheckExistingAssetsResponseDto', () {
+    // List<String> existingIds (default value: const [])
+    test('to test the property `existingIds`', () async {
+      // TODO
+    });
+
+
+  });
+
+}
--- a/server/apps/immich/src/api-v1/album/album.service.spec.ts
+++ b/server/apps/immich/src/api-v1/album/album.service.spec.ts
@ -137,6 +137,7 @@ describe('Album service', () => {
      getAssetWithNoEXIF: jest.fn(),
      getAssetWithNoThumbnail: jest.fn(),
      getAssetWithNoSmartInfo: jest.fn(),
+      getExistingAssets: jest.fn(),
    };

    sut = new AlbumService(albumRepositoryMock, assetRepositoryMock);
--- a/server/apps/immich/src/api-v1/asset/asset-repository.ts
+++ b/server/apps/immich/src/api-v1/asset/asset-repository.ts
@ -10,6 +10,9 @@ import { AssetCountByTimeBucket } from './response-dto/asset-count-by-time-group
 import { TimeGroupEnum } from './dto/get-asset-count-by-time-bucket.dto';
 import { GetAssetByTimeBucketDto } from './dto/get-asset-by-time-bucket.dto';
 import { AssetCountByUserIdResponseDto } from './response-dto/asset-count-by-user-id-response.dto';
+import { CheckExistingAssetsDto } from './dto/check-existing-assets.dto';
+import { CheckExistingAssetsResponseDto } from './response-dto/check-existing-assets-response.dto';
+import { In } from 'typeorm/find-options/operator/In';

 export interface IAssetRepository {
  create(
@ -32,6 +35,7 @@ export interface IAssetRepository {
  getAssetWithNoThumbnail(): Promise<AssetEntity[]>;
  getAssetWithNoEXIF(): Promise<AssetEntity[]>;
  getAssetWithNoSmartInfo(): Promise<AssetEntity[]>;
+  getExistingAssets(userId: string, checkDuplicateAssetDto: CheckExistingAssetsDto): Promise<CheckExistingAssetsResponseDto>;
 }

 export const ASSET_REPOSITORY = 'ASSET_REPOSITORY';
@ -279,4 +283,17 @@ export class AssetRepository implements IAssetRepository {
      relations: ['exifInfo'],
    });
  }
+
+  async getExistingAssets(userId: string, checkDuplicateAssetDto: CheckExistingAssetsDto): Promise<CheckExistingAssetsResponseDto> {
+    const existingAssets = await this.assetRepository.find({
+      select: {deviceAssetId: true},
+      where: {
+        deviceAssetId: In(checkDuplicateAssetDto.deviceAssetIds),
+        deviceId: checkDuplicateAssetDto.deviceId,
+        userId,
+      },
+    });
+    return new CheckExistingAssetsResponseDto(existingAssets.map(a => a.deviceAssetId));
+  }
+
 }
--- a/server/apps/immich/src/api-v1/asset/asset.controller.ts
+++ b/server/apps/immich/src/api-v1/asset/asset.controller.ts
@ -48,6 +48,8 @@ import { GetAssetCountByTimeBucketDto } from './dto/get-asset-count-by-time-buck
 import { GetAssetByTimeBucketDto } from './dto/get-asset-by-time-bucket.dto';
 import { QueryFailedError } from 'typeorm';
 import { AssetCountByUserIdResponseDto } from './response-dto/asset-count-by-user-id-response.dto';
+import { CheckExistingAssetsDto } from './dto/check-existing-assets.dto';
+import { CheckExistingAssetsResponseDto } from './response-dto/check-existing-assets-response.dto';

@UseGuards(JwtAuthGuard)
@ApiBearerAuth()
@ -74,6 +76,7 @@ export class AssetController {
    @GetAuthUser() authUser: AuthUserDto,
    @UploadedFile() file: Express.Multer.File,
    @Body(ValidationPipe) assetInfo: CreateAssetDto,
+    @Response({ passthrough: true }) res: Res,
  ): Promise<AssetFileUploadResponseDto> {
    const checksum = await this.assetService.calculateChecksum(file.path);

@ -111,6 +114,7 @@ export class AssetController {

      if (err instanceof QueryFailedError && (err as any).constraint === 'UQ_userid_checksum') {
        const existedAsset = await this.assetService.getAssetByChecksum(authUser.id, checksum);
+        res.status(200); // normal POST is 201. we use 200 to indicate the asset already exists
        return new AssetFileUploadResponseDto(existedAsset.id);
      }

@ -254,4 +258,16 @@ export class AssetController {
  ): Promise<CheckDuplicateAssetResponseDto> {
    return await this.assetService.checkDuplicatedAsset(authUser, checkDuplicateAssetDto);
  }
+
+  /**
+   * Checks if multiple assets exist on the server and returns all existing - used by background backup 
+   */
+  @Post('/exist')
+  @HttpCode(200)
+  async checkExistingAssets(
+    @GetAuthUser() authUser: AuthUserDto,
+    @Body(ValidationPipe) checkExistingAssetsDto: CheckExistingAssetsDto,
+  ): Promise<CheckExistingAssetsResponseDto> {
+    return await this.assetService.checkExistingAssets(authUser, checkExistingAssetsDto);
+  }
 }
--- a/server/apps/immich/src/api-v1/asset/asset.service.spec.ts
+++ b/server/apps/immich/src/api-v1/asset/asset.service.spec.ts
@ -110,6 +110,7 @@ describe('AssetService', () => {
      getAssetWithNoEXIF: jest.fn(),
      getAssetWithNoThumbnail: jest.fn(),
      getAssetWithNoSmartInfo: jest.fn(),
+      getExistingAssets: jest.fn(),
    };

    sui = new AssetService(assetRepositoryMock, a);
--- a/server/apps/immich/src/api-v1/asset/asset.service.ts
+++ b/server/apps/immich/src/api-v1/asset/asset.service.ts
@ -37,6 +37,8 @@ import { GetAssetCountByTimeBucketDto } from './dto/get-asset-count-by-time-buck
 import { GetAssetByTimeBucketDto } from './dto/get-asset-by-time-bucket.dto';
 import { AssetCountByUserIdResponseDto } from './response-dto/asset-count-by-user-id-response.dto';
 import { timeUtils } from '@app/common/utils';
+import { CheckExistingAssetsDto } from './dto/check-existing-assets.dto';
+import { CheckExistingAssetsResponseDto } from './response-dto/check-existing-assets-response.dto';

 const fileInfo = promisify(stat);

@ -466,6 +468,13 @@ export class AssetService {
    return new CheckDuplicateAssetResponseDto(isDuplicated, res?.id);
  }

+  async checkExistingAssets(
+    authUser: AuthUserDto,
+    checkExistingAssetsDto: CheckExistingAssetsDto,
+  ): Promise<CheckExistingAssetsResponseDto> {
+    return this._assetRepository.getExistingAssets(authUser.id, checkExistingAssetsDto);
+  }
+
  async getAssetCountByTimeBucket(
    authUser: AuthUserDto,
    getAssetCountByTimeBucketDto: GetAssetCountByTimeBucketDto,
--- a/server/apps/immich/src/api-v1/asset/dto/check-existing-assets.dto.ts
+++ b/server/apps/immich/src/api-v1/asset/dto/check-existing-assets.dto.ts
@ -0,0 +1,9 @@
+import { IsNotEmpty } from 'class-validator';
+
+export class CheckExistingAssetsDto {
+  @IsNotEmpty()
+  deviceAssetIds!: string[];
+
+  @IsNotEmpty()
+  deviceId!: string;
+}
--- a/server/apps/immich/src/api-v1/asset/response-dto/check-existing-assets-response.dto.ts
+++ b/server/apps/immich/src/api-v1/asset/response-dto/check-existing-assets-response.dto.ts
@ -0,0 +1,7 @@
+export class CheckExistingAssetsResponseDto {
+    constructor(existingIds: string[]) {
+      this.existingIds = existingIds;
+    }
+    existingIds: string[];
+  }
+  
--- a/server/immich-openapi-specs.json
+++ b/server/immich-openapi-specs.json
--- a/web/src/api/open-api/api.ts
+++ b/web/src/api/open-api/api.ts
@ -452,6 +452,38 @@ export interface CheckDuplicateAssetResponseDto {
     */
    'id'?: string;
 }
+/**
+ * 
+ * @export
+ * @interface CheckExistingAssetsDto
+ */
+export interface CheckExistingAssetsDto {
+    /**
+     * 
+     * @type {Array<string>}
+     * @memberof CheckExistingAssetsDto
+     */
+    'deviceAssetIds': Array<string>;
+    /**
+     * 
+     * @type {string}
+     * @memberof CheckExistingAssetsDto
+     */
+    'deviceId': string;
+}
+/**
+ * 
+ * @export
+ * @interface CheckExistingAssetsResponseDto
+ */
+export interface CheckExistingAssetsResponseDto {
+    /**
+     * 
+     * @type {Array<string>}
+     * @memberof CheckExistingAssetsResponseDto
+     */
+    'existingIds': Array<string>;
+}
 /**
 * 
 * @export
@ -2334,6 +2366,46 @@ export const AssetApiAxiosParamCreator = function (configuration?: Configuration
                options: localVarRequestOptions,
            };
        },
+        /**
+         * Checks if multiple assets exist on the server and returns all existing - used by background backup
+         * @summary 
+         * @param {CheckExistingAssetsDto} checkExistingAssetsDto 
+         * @param {*} [options] Override http request option.
+         * @throws {RequiredError}
+         */
+        checkExistingAssets: async (checkExistingAssetsDto: CheckExistingAssetsDto, options: AxiosRequestConfig = {}): Promise<RequestArgs> => {
+            // verify required parameter 'checkExistingAssetsDto' is not null or undefined
+            assertParamExists('checkExistingAssets', 'checkExistingAssetsDto', checkExistingAssetsDto)
+            const localVarPath = `/asset/exist`;
+            // use dummy base URL string because the URL constructor only accepts absolute URLs.
+            const localVarUrlObj = new URL(localVarPath, DUMMY_BASE_URL);
+            let baseOptions;
+            if (configuration) {
+                baseOptions = configuration.baseOptions;
+            }
+
+            const localVarRequestOptions = { method: 'POST', ...baseOptions, ...options};
+            const localVarHeaderParameter = {} as any;
+            const localVarQueryParameter = {} as any;
+
+            // authentication bearer required
+            // http bearer authentication required
+            await setBearerAuthToObject(localVarHeaderParameter, configuration)
+
+
+    
+            localVarHeaderParameter['Content-Type'] = 'application/json';
+
+            setSearchParams(localVarUrlObj, localVarQueryParameter);
+            let headersFromBaseOptions = baseOptions && baseOptions.headers ? baseOptions.headers : {};
+            localVarRequestOptions.headers = {...localVarHeaderParameter, ...headersFromBaseOptions, ...options.headers};
+            localVarRequestOptions.data = serializeDataIfNeeded(checkExistingAssetsDto, localVarRequestOptions, configuration)
+
+            return {
+                url: toPathString(localVarUrlObj),
+                options: localVarRequestOptions,
+            };
+        },
        /**
         * 
         * @param {DeleteAssetDto} deleteAssetDto 
@ -2953,6 +3025,17 @@ export const AssetApiFp = function(configuration?: Configuration) {
            const localVarAxiosArgs = await localVarAxiosParamCreator.checkDuplicateAsset(checkDuplicateAssetDto, options);
            return createRequestFunction(localVarAxiosArgs, globalAxios, BASE_PATH, configuration);
        },
+        /**
+         * Checks if multiple assets exist on the server and returns all existing - used by background backup
+         * @summary 
+         * @param {CheckExistingAssetsDto} checkExistingAssetsDto 
+         * @param {*} [options] Override http request option.
+         * @throws {RequiredError}
+         */
+        async checkExistingAssets(checkExistingAssetsDto: CheckExistingAssetsDto, options?: AxiosRequestConfig): Promise<(axios?: AxiosInstance, basePath?: string) => AxiosPromise<CheckExistingAssetsResponseDto>> {
+            const localVarAxiosArgs = await localVarAxiosParamCreator.checkExistingAssets(checkExistingAssetsDto, options);
+            return createRequestFunction(localVarAxiosArgs, globalAxios, BASE_PATH, configuration);
+        },
        /**
         * 
         * @param {DeleteAssetDto} deleteAssetDto 
@ -3128,6 +3211,16 @@ export const AssetApiFactory = function (configuration?: Configuration, basePath
        checkDuplicateAsset(checkDuplicateAssetDto: CheckDuplicateAssetDto, options?: any): AxiosPromise<CheckDuplicateAssetResponseDto> {
            return localVarFp.checkDuplicateAsset(checkDuplicateAssetDto, options).then((request) => request(axios, basePath));
        },
+        /**
+         * Checks if multiple assets exist on the server and returns all existing - used by background backup
+         * @summary 
+         * @param {CheckExistingAssetsDto} checkExistingAssetsDto 
+         * @param {*} [options] Override http request option.
+         * @throws {RequiredError}
+         */
+        checkExistingAssets(checkExistingAssetsDto: CheckExistingAssetsDto, options?: any): AxiosPromise<CheckExistingAssetsResponseDto> {
+            return localVarFp.checkExistingAssets(checkExistingAssetsDto, options).then((request) => request(axios, basePath));
+        },
        /**
         * 
         * @param {DeleteAssetDto} deleteAssetDto 
@ -3290,6 +3383,18 @@ export class AssetApi extends BaseAPI {
        return AssetApiFp(this.configuration).checkDuplicateAsset(checkDuplicateAssetDto, options).then((request) => request(this.axios, this.basePath));
    }

+    /**
+     * Checks if multiple assets exist on the server and returns all existing - used by background backup
+     * @summary 
+     * @param {CheckExistingAssetsDto} checkExistingAssetsDto 
+     * @param {*} [options] Override http request option.
+     * @throws {RequiredError}
+     * @memberof AssetApi
+     */
+    public checkExistingAssets(checkExistingAssetsDto: CheckExistingAssetsDto, options?: AxiosRequestConfig) {
+        return AssetApiFp(this.configuration).checkExistingAssets(checkExistingAssetsDto, options).then((request) => request(this.axios, this.basePath));
+    }
+
    /**
     * 
     * @param {DeleteAssetDto} deleteAssetDto 
--- a/web/src/lib/utils/file-uploader.ts
+++ b/web/src/lib/utils/file-uploader.ts
@ -200,12 +200,12 @@ async function fileUploader(asset: File, uploadType: UploadType) {
 }
 // TODO: This should have a proper type
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
-function handleUploadError(asset: File, respBody?: any) {
-	const extraMsg = respBody ? ' ' + respBody.message : '';
+function handleUploadError(asset: File, respBody: any, extraMessage?: string) {
+	const extraMsg = respBody ? ' ' + respBody?.message : '';

 	notificationController.show({
 		type: NotificationType.Error,
-		message: `Cannot upload file ${asset.name}!${extraMsg}`,
+		message: `Cannot upload file ${asset.name} ${extraMsg}${extraMessage}`,
 		timeout: 5000
 	});
 }