Add your email address to the status updates option and WP Database Backup will send you a status email when your backup is done.
Go to Dashboard=>Tool=>WP-DB-Backup=>Destinations=>Email Notification
Send Email Notification after backup
Enter email id for notification. Leave blank if you don’t want use this feature. If you want attach log file on notification email then select yes option (Attach log file )
Set Email Notification so that if you schedule backup then you can sure that scheduling create backup on time without any error.