Client machine running win 2008-r2 64 bit under hyper-v.
Tsm client 6.4.2.

Several errors all related to vss.  Extract from dsmerror.log follows.

09/09/2015 06:30:20 ANS5250E An unexpected error was encountered.
   TSM function name : AddToSnapshotSet
   TSM function      : 'AddToSnapshotSet failed with error 
VSS_E_UNEXPECTED_PROVIDER_ERROR. 0X8004230F'
   TSM return code   : -2147212529
   TSM file          : ..\..\common\winnt\asrutil.cpp (2281)
09/09/2015 06:30:20 ANS5250E An unexpected error was encountered.
   TSM function name : AddToSnapshotSet
   TSM function      : 'AddToSnapshotSet failed with error 
VSS_E_UNEXPECTED_PROVIDER_ERROR. 0X8004230F'
   TSM return code   : -2147212529
   TSM file          : ..\..\common\winnt\asrutil.cpp (2281)
09/09/2015 06:30:21 ANS5250E An unexpected error was encountered.
   TSM function name : BackupComplete()
   TSM function      : 'BackupComplete() failed with error VSS_E_BAD_STATE. 
0X80042301'
   TSM return code   : -2147212543
   TSM file          : ..\..\common\winnt\asrutil.cpp (2493)
09/09/2015 06:30:21 ANS1468E Backing up Automated System Recovery (ASR) files 
failed.  No files will be backed up.

09/09/2015 06:30:22 ANS1327W The snapshot operation for 'C:' failed with error 
code: -1.
09/09/2015 06:30:22 ANS5250E An unexpected error was encountered.
   TSM function name : BaStartSnapshot
   TSM function      : initializeSnapshotSet() failed, check Microsoft 
Application event log for VSS errors
   TSM return code   : -1
   TSM file          : ..\..\common\ba\backsnap.cpp (6368)
09/09/2015 06:30:22 ANS5258E Microsoft volume shadow copy snapshot 
initialization failed.
09/09/2015 06:30:22 ANS5283E The operation was unsuccessful.
09/09/2015 06:30:22 ANS1377W The client was unable to obtain a snapshot of 
'\\libmysql\c$'. The operation will continue without snapshot support.

Not sure where to go from here.  Many articles on the web about win 2003, 
haven't found much for this.