Don’t know that if Windows Server Backup Disk Space Management Changed in Server Windows Server 2012 R2. Some servers It overwrites the backups properly without filling the disk. In some environments it doesn’t .
But lets see how to remove backups to get some free space. to keep it going.
To know how many Backup Copies we have in the Current machine –
(Get-WBBackupSet –MachineName DS001).count
To keep Latest 15 Versions and remove the rest.
Remove-WBBackupSet -MachineName DS001 -KeepVersions 15