Backup & Restore - Failure to send e-mail

When having a local and cloud Filestore location selected for a weekly backup the local backup successfully completes but the cloud (Dropbox in my case) Filestore location fails there is no email sent out for Success or Failure.  I have the setting set to Both for e-mail sending.

If the Dropbox location is removed from the backup the e-mail is sent when running the backup only to the Local Filestore location.  Nothing else is changed except removing the Dropbox location from the backup.