FileServerVssAgent fail to finish the shadow copy commit in 60 seconds.
The FileServerVssAgent must finish the commit within 60 seconds to avoid fail the VSS 60 seconds Freeze/Thaw window on the client. If it exceeds 60 seconds, FileServerVssAgent will event log this error and return timeout error to the client. Upon receiving of this error, client will abort the shadow copy creation.
Check the VSS and its 3rd party hardware provider event log. Retry and make sure the commit is completed within 60 seconds.