diff --git a/plugins/Sidebar/SidebarPlugin.py b/plugins/Sidebar/SidebarPlugin.py
index ac9bd476..e6087adf 100644
--- a/plugins/Sidebar/SidebarPlugin.py
+++ b/plugins/Sidebar/SidebarPlugin.py
@@ -315,7 +315,7 @@ class UiWebsocketPlugin(object):
 
         body.append(_("""
             <li>
-             <label>{_[Download and help distribute all files]}</label>
+             <label>{_[Help distribute added optional files]}</label>
              <input type="checkbox" class="checkbox" id="checkbox-autodownloadoptional" {checked}/><div class="checkbox-skin"></div>
         """))
 
@@ -326,6 +326,7 @@ class UiWebsocketPlugin(object):
                  <label>{_[Auto download big file size limit]}</label>
                  <input type='text' class='text text-num' value="{autodownload_bigfile_size_limit}" id='input-autodownload_bigfile_size_limit'/><span class='text-post'>MB</span>
                  <a href='#Set' class='button' id='button-autodownload_bigfile_size_limit'>{_[Set]}</a>
+                 <a href='#Download+previous' class='button' id='button-autodownload_previous'>{_[Download previous files]}</a>
                 </div>
             """))
         body.append("</li>")
@@ -754,8 +755,6 @@ class UiWebsocketPlugin(object):
     @flag.no_multiuser
     def actionSiteSetAutodownloadoptional(self, to, owned):
         self.site.settings["autodownloadoptional"] = bool(owned)
-        self.site.bad_files = {}
-        gevent.spawn(self.site.update, check_files=True)
         self.site.worker_manager.removeSolvedFileTasks()
 
     @flag.no_multiuser
diff --git a/plugins/Sidebar/media/Sidebar.coffee b/plugins/Sidebar/media/Sidebar.coffee
index b65912d4..47c6e7f8 100644
--- a/plugins/Sidebar/media/Sidebar.coffee
+++ b/plugins/Sidebar/media/Sidebar.coffee
@@ -372,6 +372,14 @@ class Sidebar extends Class
 				@updateHtmlTag()
 			return false
 
+		# Site start download optional files
+		@tag.find("#button-autodownload_previous").off("click touchend").on "click touchend", =>
+			@wrapper.ws.cmd "siteUpdate", {"address": @wrapper.site_info.address, "check_files": true}, =>
+				@wrapper.notifications.add "done-download_optional", "done", "Optional files downloaded", 5000
+
+			@wrapper.notifications.add "start-download_optional", "info", "Optional files download started", 5000
+			return false
+
 		# Database reload
 		@tag.find("#button-dbreload").off("click touchend").on "click touchend", =>
 			@wrapper.ws.cmd "dbReload", [], =>