Trouble with backup on SBS2008

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http://serverfault.com – We have an SBS2008 installation, which has a backup task. It creates a backup twice a day onto external storage. This worked for a long time. But the backup can't be performed now. The last valid backup was before some Exchange updates, SBS Update Rollup 8 and SharePoint updates were installed. The only error in Event Logs is for VSS (the Volume Shadow Service), which I only have in German. Things I've done: restart the server chkdsk /r /f for all volumes restart the VSS service googling manual backup Nothing's helped. How can I set up the backup again? Edit: i use the built in ba (HowTos)