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We currently have a windows small business server 2008, that is being backed up using the default SBS tools (windows server backup). Things seem to work properly, but the backups are taking a very long time (up to 12 hours). Everything is configured to use incremental backups, but when I look through the logs I notice our C: drive is actually doing a full 65GB backup every run, not an incremental one. Does anyone know why this is happening and what we can do to fix it?

I'm not sure if it is the default, but I noticed that shadow copies are disabled for the C: drive, could this be preventing incremental backups from being performed?

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What are you backing up to? If you're backing up to a shared network folder, WSB will only store one full backup per server, each new backup wiping out the last.

Also yes you need VSS.

And it could also happen if more than 50% of the source files have changed since the last backup.

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  • We are backing up to an iSCSI target. Do I need to enable VSS in the volume properties on the C: drive?
    – LorenVS
    Feb 27, 2013 at 21:14
  • Oh, also, are you choosing the "Faster backup performance" option in WSB?
    – Ryan Ries
    Feb 27, 2013 at 23:49

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