I have a Windows 2008 R2 server where Windows Server Backup has started failing.
WSB error says "there is not enough space on the disk". This doesn't make sense to me. The backup is a full backup of system state, C: and E: (D: is the DVD drive). C: is using 91GB out of 120GB. E: is using 159GB out of 810GB. Together this is 250GB plus the system state to back up. The backup drive is a 500GB drive in a removable cage. There are 3 swappable disks but I started over from scratch and deleted the job. I then recreated the job and told it to use just the disk that's currently in place and had it format the drive.
The only other clue is in the Event log the error code given is 2155348010. So far I haven't found anything useful about that code.
The backup completes its backup of System State, Bare Metal Recovery, System Reserved partition, and C:. Then it fails when it starts to backup E:.
I hope someone can provide an answer so I can get this backup working again. What I'm seeing doesn't make any sense.
Jonathan