Do not backup stopped apps

src/backups.js

@@ -1027,6 +1027,10 @@ function backupBoxWithAppBackupIds(appBackupIds, tag, progressCallback, callback
 
 function canBackupApp(app) {
     // only backup apps that are installed or specific pending states
+
+    // stopped apps cannot be backed up because addons might be down (redis)
+    if (app.runState === apps.RSTATE_STOPPED) return false;
+
     // we used to check the health here but that doesn't work for stopped apps. it's better to just fail
     // and inform the user if the backup fails and the app addons have not been setup yet.
     return  app.installationState === apps.ISTATE_INSTALLED ||