Files to review when troubleshooting VSS snapshot errors
To determine the cause of VSS errors on your system you can run the following commands on the windows system from a command prompt with elevated privileges (Run as Administrator) and review the content
For Windows 2003
C:\> vssadmin list writers > C:\temp\writers.txt C:\> mountvol > C:\temp\mountvol.txt C:\> vssadmin list shadows > C:\temp\shadows.txt C:\> vssadmin list shadow-storage > C:\temp\shadowstorage.txt C:\> vssadmin list providers > C:\temp\providers.txt
For Windows 2008 and 2008 R2
C:\> vssadmin list writers > c:\temp\writers.txt C:\> vssadmin list providers > c:\temp\providers.txt C:\> vssadmin list volumes > c:\temp\volumes.txt C:\> diskshadow /L c:\temp\shadow.txt DISKSHADOW> list writers detailed DISKSHADOW> exit C:\>
Reference: https://technet.microsoft.com/en-gb/library/cc772172.aspx