Microsoft released the following information regarding a VSS bug that could lead to potential data loss.
Article ID: 2748349 (Full article here)
Corrupted files are found in backup data that is restored by using the Windows Volume Shadow Copy feature in Windows Server 2003, Windows Vista, Windows Server 2008, Windows 7, or Windows Server 2008 R2
Consider the following scenario:
Note: NTBackup, Windows Server Backup, System Center Data Protection Manager (DPM) or any third-party backup application’s backup data can be affected. Please contact your third-party backup solution manufacturer to determine whether they use the Windows Volume Shadow Copy feature to create backups.
This issue occurs because a volume bitmap does not accurately reflect the clusters that are used by the files on a volume that is a multiple of 8 GB. Additionally, this occurs when a Windows Volume Shadow copy is invoked on an extended volume. Therefore, the data that is read or copied from a shadow copy may not accurately represent the file data. When the data is saved to the destination, it is saved in a corrupted state.
Please follow the relevant steps as outlined in Article ID: 2748349