Windows Backup Vista Ultimate

I had scheduled full backups working in Visat Ultimate, but now all of
a sudden they've stopped. Trying to execute from the command line I
get this:

C:\Windows\system32>wbadmin Start backup -allcritical -backupTarget:N:
-include:C: -quiet
wbadmin 1.0 - Backup command-line tool
(C) Copyright 2004 Microsoft Corp.

Server execution failed

The event viewer is saying its a event ID 544. Dunno if this means
anything, but the last good backup was back on the 11th. The only two
programs I've installed since then have been Visual Studio 2005
Professional with MSDN. And some lil Diet app that I want to develop
on (doesn't run unless open).

Any suggestions?

Thanks,
Markus
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