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Event ID: 33 Source: VolSnap

The oldest shadow copy of volume <volume> was deleted to keep disk space usage for shadow copies of volume <volume> below the user defined limit.
When you run Disk Defragmenter on a volume with shadow copies activated, all or some of your shadow copies may be lost, starting with the oldest shadow copies. See ME312067 for more information on this issue.
Go to the server that logs this event and right click on any of the drives, then choose properties. Here, there will be a “shadow copies” tab. Under settings, you can define how much room this feature has. Shadow copy itself is pretty much the “rollback” feature in Win 2003.

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