Skhairuddin’s Blog

ERROR – The location for backup is a critical volume
April 18, 2009, 12:20 pm
Filed under: Backup

When you try to perform a system state backup to a volume on which the system state file resides, you receive the following error in Windows Server 2008.

ERROR – The location for backup is a critical volume.

This behavior occurs because system state backups to critical volumes are blocked in Windows Server 2008.


You can change the default behavior of Windows Server 2008 by adding a registry entry. You must also verify that the following prerequisites are met before you perform a system state backup to a critical volume.

Prerequisites to perform system state backups to critical volumes


  • Make sure that the target volume has no shadow copy before the backup starts.
  • If a system state backup is stored on a source volume, backup settings should be configured for full backups. By default, settings are configured for full backups.
  • Periodically check that no other user or program maintains a shadow copy on the target volume.
  • Do not keep volume level backups and system state backups in the same location.
  • The volume used to store the system state backup needs twice the amount of free space as the size of the system state backup until the backup completes.

To enable the system state backup files to be targeted to critical volumes, you must set the value of the AllowSSBToAnyVolume registry entry under the following registry subkey:

Set the value of this entry as follows:
Name: AllowSSBToAnyVolume
Data type: DWORD
Value data: 1

Note When this value is set to 1, system state backups to any volume are enabled. To revert to the default behavior, set the value to 0


For more Information Please see the following KB.