KB1697: VSS errors related to NTDS writer failures
https://www.veeam.com/kb169703.12.2012 · Error: VSSControl: -1 Backup job failed. Cannot create a shadow copy of the volumes containing writer's data. Cannot prepare the [NTDS] data to a subsequent restore operation. Cannot process NTDS data. Cannot create a backup copy of the BCD. Cannot get [BcdStore] object. COM error: Code: 0xffffffff