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Event ID: 20001 Source: VSS

Source
Level
Description
Volume Shadow Copy Service error: Cannot find diff areas for creating shadow copies. Please add at least one NTFS drive to the system with enough free space. The free space needed is at least 300 Mb for each volume to be shadow copied.

For more information see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Comments
 
Check on free space. If you have enough free space but are still getting this error try running "vssadmin list writers" from a command line. Check to see if any of the VSS writers are in a state other than stable.  If so you can try and stop then restart the VSS Services, and if that fails, reboot the server should resolve the problem.

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