A collegue of mine ran into an issue where he couldn’t create ssb(System State Backup) on a disk, below an explanation and solution
DPM uses inbox Windows Server Backup(WSB) to protect System State and WSB uses local disk to write the backup.
DPM then writes the backup from the disk to the tape. DPM by default selects the disk that has the maximum free
space available. In this case it looks like the disk selected is a critical volume. DPM sets a registry key “AllowSSBToAnyVolume”
under “SYSTEM\\CurrentControlSet\\Services\\wbengine\\SystemStateBackup” to allow System State Backup to happen even on
a critical volume.
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wbengine\SystemStateBackup]
“AllowSSBToAnyVolume”=dword:00000001
scdpm2010 