Same Issue here.
[Normal] From: OB2BAR_VSSBAR@cloudprodu03.cloud.priv "HyperV" Time: 7/22/2013 10:30:43 AM
Exiting Shadow Copy Set creation phase.
[Major] From: OB2BAR_VSSBAR@cloudprodu03.cloud.priv "HyperV" Time: 7/22/2013 10:30:44 AM
[145:575] Writer 'Microsoft Hyper-V VSS Writer' failed to prepare files for backup:
Reported state: VSS_WS_FAILED_AT_PREPARE_SNAPSHOT
Expected state: VSS_WS_WAITING_FOR_BACKUP_COMPLETE
Failure code: VSS_E_WRITERERROR_RETRYABLE
[Major] From: OB2BAR_VSSBAR@cloudprodu03.cloud.priv "HyperV" Time: 7/22/2013 10:30:44 AM
Cannot perform backup of:
'/Microsoft Hyper-V VSS Writer/Virtual Machines/Backup Using Child Partition Snapshot\Acobo_01',
which contains data in:
C:\ClusterStorage\FAcobo01\Acobo_01\Virtual Machines\5E2D607F-5623-4621-B672-88CE5E0EB790.xml
C:\ClusterStorage\FAcobo01\Acobo_01\WIN2003R2SP2SE32.vhdx
C:\ClusterStorage\FAcobo01\Acobo_01\Snapshots\5E2D607F-5623-4621-B672-88CE5E0EB790-BackupSnapshot.xml
C:\ClusterStorage\FAcobo01\Acobo_01\WIN2003R2SP2SE32-ChildVhd.avhdx
[Major] From: OB2BAR_VSSBAR@cloudprodu03.cloud.priv "HyperV" Time: 7/22/2013 10:30:44 AM
There is no data to be backed up.
[Major] From: OB2BAR_VSSBAR@cloudprodu03.cloud.priv "HyperV" Time: 7/22/2013 10:30:45 AM
Backup failed.
[Normal] From: OB2BAR_VSSBAR@cloudprodu03.cloud.priv "HyperV" Time: 7/22/2013 10:30:47 AM
Deleting Volume Shadow Copies and releasing the volumes.
I do have agent on version 7.01, still get the same error.
any other ideas?