Scenario - Windows 2008 R2 domain controller, 2008 Forest/Domain Functional Level, server has a solitary C: drive of 200Gb, there are no other local drives (customer rules).
In order to try and run a System State Backup I use the following command:
wbadmin start systemstatebackup -backupTarget:c: -quiet
I have also set the registry key AllowSSBToAnyVolume (REG_DWORD, value 1) in Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wbengine to allow me to backup to the C: drive (server has been rebooted so setting takes effect), as described here - http://technet.microsoft.com/en-us/library/cc771139%28v=ws.10%29.aspx
Problem is, the wbadmin command still refuses to backup the System State to C:, failing with the message:
ERROR - The location for backup is a critical volume.
So despite the AllowSSBToAnyVolume setting it still doesn't work - any ideas why (the drive has sufficient free space), and what I do to get around this? Tried backing up to a network share but get a similar failure massage.
(Unfortunately adding another disk to the domain controller is not an option).