Basically WSB always leaves 1/8 of the backup volume allocated to shadow copies, which is how it stores previous backups. Windows Server Backup automatic disk usage management, also on TechNet, explains how the auto-delete works, why it sometimes doesn’t delete enough, and why backups fail. The Windows Server Backup Overview on TechNet says, “Windows Server Backup does not require user intervention to periodically delete older backups to free up disk space for newer backups-older backups are deleted automatically.” Unfortunately, that is not always the case.
More research and forum posts have turned up some additional information. I had to manually delete old shadow copies to get the backup running again.
I had a backup fail for lack of disk space, even though 61 backups were available. I’m having similar issues with Windows Server Backup (WSB) on Server Essentials 2012. Update Janu2012 Essentials Issues and References Two days and two backups later, the F: drive is showing 115GB (16.5%) free and 187GB in shadow copies. What? How did I drop from 122GB free to 97.7GB free in a matter of hours? I did delete the shadows while a backup was running, but should that matter? Does Windows Server Backup just use as much space as possible? I just deleted another five shadow copies, this time with no backup running, and I’m back to 126GB free and 171GB in shadow copies. By the next morning, it was 97.7GB free and 199GB in shadow copies. Update November 17, 2012Ībout three hours after I did the above, free disk space fell under 15% again. I do system state backups together with other backups. So apparently that’s only needed if you’re doing separate system state backups. This command can be used to delete backups that only contain the system state. Wbadmin delete systemstatebackup -deleteOldestĮRROR - No system state backups were found. Tried this command to delete system state backups: I could delete more-there must be 20 left. That freed up about 4.5GB per shadow copy, so now 122GB free (17%), 175GB in shadow copies. Vssadmin list shadows /for=f: Delete Old Shadow Copiesĭelete 5 oldest shadow copies on the target volume: Researchīackup Version and Space Management in Windows Server Backup Today free space on the backup drive F: dropped below 100GB of 698GB, triggering a 15% monitoring threshold.
A client uses Windows Server Backup to back up a small Hyper-V server running Windows Server 2008 R2.
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