14 November 2011

System writer is not found in the backup

Symptoms: When you perform a system state backup using Windows Server Backup on Windows Server 2008, the backup fails with the following error:

System writer is not found in the backup.

Cause: The system writer fails because permissions to files in the %windir%\winsxs\filemaps\ or %windir%\winsxs\temp\PendingRenames directories are incorrect.

Resolution: To resolve this issue, type the following commands from an elevated command prompt:

Takeown /f %windir%\winsxs\temp\PendingRenames /a
icacls %windir%\winsxs\temp\PendingRenames /grant "NT AUTHORITY\SYSTEM:(RX)"
icacls %windir%\winsxs\temp\PendingRenames /grant "NT Service\trustedinstaller:(F)"
icacls %windir%\winsxs\temp\PendingRenames /grant BUILTIN\Users:(RX)
Takeown /f %windir%\winsxs\filemaps\* /a
icacls %windir%\winsxs\filemaps\*.* /grant "NT AUTHORITY\SYSTEM:(RX)"
icacls %windir%\winsxs\filemaps\*.* /grant "NT Service\trustedinstaller:(F)"
icacls %windir%\winsxs\filemaps\*.* /grant BUILTIN\Users:(RX)
net stop cryptsvc
net start cryptsvc

At the end type the following command to verify that the system writer is now listed:

vssadmin list writers

If the system writer is still missing, then open the Regedit and navigate to the following key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\VSS\VssAccessControl.
Change the value of NT AUTHORITY\NETWORK SERVICE (REG_DWORD) to 1.
You may also want to check and change the entry for other services (LOCAL SERVICE, NetworkService) those services will be indicated by event 8213 in your Application Event Log.
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