title: Operating system error 0x80090006(Invalid Signature) by Scheduled Backup TFS 2015
body: <p>I have a Windows Server 2012 R2 with TFS 2015 Update 2 installed.  I configured Scheduled backups in TFS Administration Console.</p>
  
  <p>When I manually take a full backup, everything works and the backupfiles are nicely dropped on a networkshare.<br>
  However, the automatic backup (at night) fails.</p>
  
  <p>From the event viewer: Exception Message: Cannot open backup device '\\...\Tfs_Configuration_9859327876866326120F.bak'. Operating system error 0x80090006(Invalid Signature.).
  BACKUP DATABASE is terminating abnormally. (type SqlException)</p>
  
  <p>Help is much appreciated!</p>