If Client PC is not running, or not reachable, or Enjay Backup Hub Client is not running, then the Backup Hub will fail to take the backup.

But in that scenario also, it will send Email Alert.

You can see below image in which backup not succeeded.

If Backup success then you will get alert of success full run.

You can see in below image.

Tip: Never forget to configure and test your email settings.