You should have a employee who is appointed the task of receiving the backup notifications. They should be receiving an email to notify them that the backups are working.
You can also check the backup results by logging into your server desktop and opening the Server Backup Manager.
You can find it here:
Pre 2018 Servers = Start - Administration Tools - Windows Server Backup
Server supplied in 2018 - on = Start - AOMEI Backupper - Utilities - Logs