new fcm topic 'backup-fs-errors'

common/defaults.module.ts

@@ -1,6 +1,7 @@
 export const fcmTopics = {
   serverData: 'monitoring-serverdata',
-  services: 'monitoring-services'
+  services: 'monitoring-services',
+  backups: 'backup-fs-errors'
 };
 
 export const serverSync = {