TFS Database Backup Failed : There is an error in XML document - but which Doc?

Question

Our Nightly TFS 2012 backup has just started to fail. It also fails when run directly through TFS Express Administration Console.

Which file is the following error a

Answer 1

Look in the folder where your backups are configured to be placed. there will be an XML file there, can't remember the name, but maybe something like BackupSets.xml