We have 4 storage groups to backup Full with Exec 11d onto a NAS every night. The backup jobs ran fine until we jump to SP1 recently (not sure if that's the exact cause of it). Below are the errors in the job log. The backups also fail w/o completion when I try a manual backup. I've already tried recreating a new media set, new device, new job. Tried changing the allocation size from 1GB to 650MB. Tried updating the software, rebooting the server. The jobs will still fail randomly during a backup. On the other hand, we also backup the system state, and all of the system root files. Those run fine, maybe because it's small enough that it doesn't require that much time before it fails?

 

ERRORS

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Backup- \\SHOPMAIL\Microsoft Information Store\Fourth Storage Group
V-79-57344-65245 - A failure occurred accessing the object list.

V-79-57344-65245 - A failure occurred accessing the object list.

V-79-57344-65235 - A failure occurred setting the Component backup status.

Writer Name: Microsoft Exchange Writer, Writer ID: {76FE1AC4-15F7-4BCD-987E-8E1ACB462FB7}, Last error: The VSS Writer failed, but the operation can be retried (0x800423f3), State: Failed during backup complete operation (12).