[There's a reason that Yoda is the unofficial mascot of SBS. Size indeed matters not.] Rule of backup. Don't do multiple ones at the same time. - THE OFFICIAL BLOG OF THE SBS DIVA
Tue, Apr 26 2011 22:28 bradley

Rule of backup. Don't do multiple ones at the same time.

Rule of backup.  Don't do multiple ones at the same time.

http://social.microsoft.com/Forums/en-US/partnerwinserversbs/thread/f8898fce-0641-4477-9ef9-4c2c58b72c8f

I have an SBS 2008 SP2 server that does not run VSS on schedule. In the event logs there is event ID 12310 source VSS and the desciption is - "Volume Shadow Copy Service error: The shadow copy could not be committed - operation timed out. Error context: DeviceIoControl(\\?\Volume{f43780c5-d303-11df-8272-806e6f6e6963}"

I can click on "Create Now" on the Shadow Copies settings and it works.

It turns out this problem is due to Zenith BDR taking a snapshot at the same time. I found this problem existed on most servers that are being backed up with that BDR. I changed the schedule to take a snapshot at 7:05 and they all worked.

Check what time your snapshots and backups are running and move them to better times.

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