diff --git a/src/calibre/gui2/tweak_book/boss.py b/src/calibre/gui2/tweak_book/boss.py
index ce1a2b72fc..5cfbbd3d54 100644
--- a/src/calibre/gui2/tweak_book/boss.py
+++ b/src/calibre/gui2/tweak_book/boss.py
@@ -23,12 +23,12 @@ from calibre.ebooks.oeb.polish.cover import mark_as_cover, mark_as_titlepage
 from calibre.ebooks.oeb.polish.pretty import fix_all_html, pretty_all
 from calibre.ebooks.oeb.polish.replace import rename_files
 from calibre.ebooks.oeb.polish.split import split, merge, AbortError
-from calibre.gui2 import error_dialog, choose_files, question_dialog, info_dialog
+from calibre.gui2 import error_dialog, choose_files, question_dialog, info_dialog, choose_save_file
 from calibre.gui2.dialogs.confirm_delete import confirm
 from calibre.gui2.tweak_book import set_current_container, current_container, tprefs, actions, editors
 from calibre.gui2.tweak_book.undo import GlobalUndoHistory
 from calibre.gui2.tweak_book.file_list import NewFileDialog
-from calibre.gui2.tweak_book.save import SaveManager
+from calibre.gui2.tweak_book.save import SaveManager, save_container
 from calibre.gui2.tweak_book.preview import parse_worker, font_cache
 from calibre.gui2.tweak_book.toc import TOCEditor
 from calibre.gui2.tweak_book.editor import editor_from_syntax, syntax_from_mime
@@ -581,6 +581,35 @@ class Boss(QObject):
         container = clone_container(c, tdir)
         self.save_manager.schedule(tdir, container)
 
+    def save_copy(self):
+        c = current_container()
+        ext = c.path_to_ebook.rpartition('.')[-1]
+        path = choose_save_file(self.gui, 'tweak_book_save_copy', _(
+            'Choose path'), filters=[(_('Book (%s)') % ext.upper(), [ext.lower()])], all_files=False)
+        if not path:
+            return
+        tdir = self.mkdtemp(prefix='save-copy-')
+        container = clone_container(c, tdir)
+        for name, ed in editors.iteritems():
+            if ed.is_modified:
+                with c.open(name, 'wb') as f:
+                    f.write(ed.data)
+
+        def do_save(c, path, tdir):
+            save_container(c, path)
+            shutil.rmtree(tdir, ignore_errors=True)
+            return path
+
+        self.gui.blocking_job('save_copy', _('Saving copy, please wait...'), self.copy_saved, do_save, container, path, tdir)
+
+    def copy_saved(self, job):
+        if job.traceback is not None:
+            return error_dialog(self.gui, _('Failed to save copy'),
+                    _('Failed to save copy, click Show details for more information.'), det_msg=job.traceback, show=True)
+        msg = _('Copy saved to %s') % job.result
+        info_dialog(self.gui, _('Copy saved'), msg, show=True)
+        self.gui.show_status_message(msg, 5)
+
     def report_save_error(self, tb):
         if self.doing_terminal_save:
             prints(tb, file=sys.stderr)
diff --git a/src/calibre/gui2/tweak_book/save.py b/src/calibre/gui2/tweak_book/save.py
index d1b2680ac5..508b8673fd 100644
--- a/src/calibre/gui2/tweak_book/save.py
+++ b/src/calibre/gui2/tweak_book/save.py
@@ -18,6 +18,18 @@ from calibre.gui2.progress_indicator import ProgressIndicator
 from calibre.utils import join_with_timeout
 from calibre.utils.filenames import atomic_rename
 
+def save_container(container, path):
+    temp = PersistentTemporaryFile(
+        prefix=('_' if iswindows else '.'), suffix=os.path.splitext(path)[1], dir=os.path.dirname(path))
+    temp.close()
+    temp = temp.name
+    try:
+        container.commit(temp)
+        atomic_rename(temp, path)
+    finally:
+        if os.path.exists(temp):
+            os.remove(temp)
+
 class SaveWidget(QWidget):
 
     def __init__(self, parent=None):
@@ -105,18 +117,9 @@ class SaveManager(QObject):
         self.save_done.emit()
 
     def do_save(self, tdir, container):
-        temp = None
         try:
-            path = container.path_to_ebook
-            temp = PersistentTemporaryFile(
-                prefix=('_' if iswindows else '.'), suffix=os.path.splitext(path)[1], dir=os.path.dirname(path))
-            temp.close()
-            temp = temp.name
-            container.commit(temp)
-            atomic_rename(temp, path)
+            save_container(container, container.path_to_ebook)
         finally:
-            if temp and os.path.exists(temp):
-                os.remove(temp)
             shutil.rmtree(tdir, ignore_errors=True)
 
     @property
diff --git a/src/calibre/gui2/tweak_book/ui.py b/src/calibre/gui2/tweak_book/ui.py
index 1e21e142c9..aa4d79d788 100644
--- a/src/calibre/gui2/tweak_book/ui.py
+++ b/src/calibre/gui2/tweak_book/ui.py
@@ -155,6 +155,9 @@ class Main(MainWindow):
 
         self.keyboard.finalize()
 
+    def show_status_message(self, msg, timeout=5):
+        self.status_bar.showMessage(msg, int(timeout*1000))
+
     def elided_text(self, text, width=200, mode=Qt.ElideMiddle):
         return elided_text(self.font(), text, width=width, mode=mode)
 
@@ -185,6 +188,7 @@ class Main(MainWindow):
                                       _('Revert book state to after the next action (Redo)'))
         self.action_save = reg('save.png', _('&Save'), self.boss.save_book, 'save-book', 'Ctrl+Shift+S', _('Save book'))
         self.action_save.setEnabled(False)
+        self.action_save_copy = reg('save.png', _('Save a &copy'), self.boss.save_copy, 'save-copy', 'Ctrl+Alt+S', _('Save a copy of the book'))
         self.action_quit = reg('quit.png', _('&Quit'), self.boss.quit, 'quit', 'Ctrl+Q', _('Quit'))
         self.action_preferences = reg('config.png', _('&Preferences'), self.boss.preferences, 'preferences', 'Ctrl+P', _('Preferences'))
 
@@ -279,7 +283,10 @@ class Main(MainWindow):
         f = b.addMenu(_('&File'))
         f.addAction(self.action_new_file)
         f.addAction(self.action_open_book)
+        f.addSeparator()
         f.addAction(self.action_save)
+        f.addAction(self.action_save_copy)
+        f.addSeparator()
         f.addAction(self.action_quit)
 
         e = b.addMenu(_('&Edit'))