diff --git a/app/Http/Controllers/ActivityController.php b/app/Http/Controllers/ActivityController.php
index f008681254b7..9415cfd8aa1a 100644
--- a/app/Http/Controllers/ActivityController.php
+++ b/app/Http/Controllers/ActivityController.php
@@ -11,12 +11,16 @@
 
 namespace App\Http\Controllers;
 
+use App\Http\Requests\Activity\DownloadHistoricalInvoiceRequest;
 use App\Models\Activity;
 use App\Transformers\ActivityTransformer;
+use App\Utils\Traits\Pdf\PdfMaker;
 use Illuminate\Http\Request;
 
 class ActivityController extends BaseController
 {
+    use PdfMaker;
+
     protected $entity_type = Activity::class;
 
     protected $entity_transformer = ActivityTransformer::class;
@@ -78,7 +82,26 @@ class ActivityController extends BaseController
         $activities = Activity::orderBy('created_at', 'DESC')->company()
                                 ->take($default_activities);
 
-
         return $this->listResponse($activities);
     }
+
+    public function downloadHistoricalInvoice(DownloadHistoricalInvoiceRequest $request, Activity $activity)
+    {
+
+        $pdf = $this->makePdf(null, null, $activity->backup->html_backup);
+
+        if(isset($activity->invoice_id))
+            $filename = $activity->invoice->number . ".pdf";
+        elseif(isset($activity->quote_id))
+            $filename = $activity->quote->number . ".pdf";
+        elseif(isset($activity->credit_id))
+            $filename = $activity->credit->number . ".pdf";
+        else
+            $filename = "backup.pdf";
+
+        return response()->streamDownload(function () use($pdf) {
+            echo $pdf;
+        }, $filename);
+    }
+
 }
diff --git a/app/Http/Requests/Activity/DownloadHistoricalInvoiceRequest.php b/app/Http/Requests/Activity/DownloadHistoricalInvoiceRequest.php
new file mode 100644
index 000000000000..6c3e2a8e6661
--- /dev/null
+++ b/app/Http/Requests/Activity/DownloadHistoricalInvoiceRequest.php
@@ -0,0 +1,29 @@
+<?php
+/**
+ * Invoice Ninja (https://invoiceninja.com)
+ *
+ * @link https://github.com/invoiceninja/invoiceninja source repository
+ *
+ * @copyright Copyright (c) 2020. Invoice Ninja LLC (https://invoiceninja.com)
+ *
+ * @license https://opensource.org/licenses/AAL
+ */
+
+namespace App\Http\Requests\Activity;
+
+use App\Http\Requests\Request;
+use App\Models\Activity;
+
+class DownloadHistoricalInvoiceRequest extends Request
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     *
+     * @return bool
+     */
+
+    public function authorize() : bool
+    {
+        return auth()->user()->can('view', $this->activity);
+    }
+}
diff --git a/app/Models/Activity.php b/app/Models/Activity.php
index 8c56b8d41561..36831aebb94f 100644
--- a/app/Models/Activity.php
+++ b/app/Models/Activity.php
@@ -11,10 +11,14 @@
 
 namespace App\Models;
 
+use App\Utils\Traits\MakesHash;
 use Illuminate\Database\Eloquent\Model;
 
 class Activity extends StaticModel
 {
+
+    use MakesHash;
+    
     const CREATE_CLIENT=1; //
     const ARCHIVE_CLIENT=2; //
     const DELETE_CLIENT=3; //
@@ -144,4 +148,16 @@ class Activity extends StaticModel
     {
         return $this->belongsTo(Company::class);
     }
+
+
+    public function resolveRouteBinding($value)
+    {
+        if (is_numeric($value)) {
+            throw new ModelNotFoundException("Record with value {$value} not found");
+        }
+
+        return $this
+            //->withTrashed()
+            ->where('id', $this->decodePrimaryKey($value))->firstOrFail();
+    }
 }
diff --git a/routes/api.php b/routes/api.php
index f6640a31b5c1..c96572768728 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -26,7 +26,9 @@ Route::group(['middleware' => ['api_db', 'token_auth', 'locale'], 'prefix' => 'a
     Route::get('ping', 'PingController@index')->name('ping');
     Route::get('health_check', 'PingController@health')->name('health_check');
 
-    Route::resource('activities', 'ActivityController');// name = (clients. index / create / show / update / destroy / edit
+    Route::get('activities', 'ActivityController@index');
+
+    Route::get('activities/download_invoice/{activity}', 'ActivityController@downloadHistoricalInvoice');
 
     Route::resource('clients', 'ClientController');// name = (clients. index / create / show / update / destroy / edit
 
diff --git a/tests/Integration/DownloadHistoricalInvoiceTest.php b/tests/Integration/DownloadHistoricalInvoiceTest.php
new file mode 100644
index 000000000000..795c05be3581
--- /dev/null
+++ b/tests/Integration/DownloadHistoricalInvoiceTest.php
@@ -0,0 +1,71 @@
+<?php
+
+namespace Tests\Integration;
+
+use App\Events\Invoice\InvoiceWasUpdated;
+use App\Models\Activity;
+use App\Repositories\ActivityRepository;
+use App\Utils\Ninja;
+use App\Utils\Traits\MakesHash;
+use Illuminate\Foundation\Testing\Concerns\InteractsWithDatabase;
+use Illuminate\Foundation\Testing\DatabaseTransactions;
+use Illuminate\Support\Facades\Cache;
+use Tests\MockAccountData;
+use Tests\TestCase;
+
+/**
+ * @test
+ * @covers App\Http\Controllers\ActivityController
+ */
+class DownloadHistoricalInvoiceTest extends TestCase
+{
+    use MockAccountData;
+    use DatabaseTransactions;
+    use MakesHash;
+
+    public function setUp() :void
+    {
+        parent::setUp();
+
+        $this->makeTestData();
+    }
+
+    private function mockActivity()
+    {
+        $activity_repo = new ActivityRepository();
+
+        $obj = new \stdClass;
+        $obj->invoice_id = $this->invoice->id;
+        $obj->user_id = $this->invoice->user_id;
+        $obj->company_id = $this->company->id;
+
+        $activity_repo->save($obj, $this->invoice, Ninja::eventVars());
+
+    }
+    public function testActivityAccessible()
+    {
+        $this->mockActivity();
+
+        $this->assertNotNull($this->invoice->activities);
+    }
+
+    public function testBackupExists()
+    {
+        $this->mockActivity();
+
+        $this->assertNotNull($this->invoice->activities->first()->backup->html_backup);
+    }
+
+
+    public function testBackupDownload()
+    {
+        $this->mockActivity();
+
+        $response = $this->withHeaders([
+                'X-API-SECRET' => config('ninja.api_secret'),
+                'X-API-TOKEN' => $this->token
+            ])->get('/api/v1/activities/download_invoice/'.$this->encodePrimaryKey($this->invoice->activities->first()->id));
+
+        $response->assertStatus(200);
+    }
+}