Article ID: 944530 - View products that this article applies to.
Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
When you try to perform a system state backup to a volume on which the system state file resides, you receive an error, as mentioned below:
In Windows Server 2008, you receive the following error:
ERROR - The location for backup is a critical volume.
In Windows Server 2008 R2, you receive the following error:
ERROR - The backup storage location is invalid. You cannot use a volume that is included in the backup as a storage location.
This behavior occurs because system state backups to critical volumes are blocked in Windows Server 2008 and Windows Server 2008 R2.
You can change the default behavior of Windows Server 2008 and Windows Server 2008 R2 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
Registry entry to enable system state backups to critical volumesWarning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
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: AllowSSBToAnyVolumeNote 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.
Data type: DWORD
Value data: 1
The restriction to target the system state backup to any volume is a new feature in Windows Server 2008 and Windows Server 2008 R2.
If all the previous prerequisites are not met, you may see shadow-copy loss when you perform a backup. In worst condition backup itself may fail because of the snapshot from which backup was taken is becoming lost while writing the backup.
Steps to reproduce the behavior
Backup and Recovery Overview for Windows Server 2008
Backup and Recovery Overview for Windows Server 2008 R2
Article ID: 944530 - Last Review: November 4, 2011 - Revision: 3.0