nmdange wrote:If you have App-Aware processing disabled, but have the option "VMWare Tools Quiescence" or "Enable Hyper-V Guest Quiescence" set in the advanced storage settings, then there is no difference in the impact to the Virtual Machine. With AAP, Veeam connects to the VM to instruct it to do a VSS snapshot, with the other option, the Hypervisor uses the VM integration tools to instruct the VM to do a VSS snapshot. The end result is the same in both cases, you have an application consistent VSS snapshot.
This is not true, since AAIP is a bit more than just VSS quiescence
. AAIP ensures that each VSS-aware application state is transactionally consistent by performing some additional application-specific steps to prepare the application for further VSS-aware restore. It is strongly recommended to enable AAIP on all Windows VMs, unless there are reasons to not do that.
As for the domain controllers, thanks to AAIP, possible issues upon restore (such as USN rollback) are handled automatically. I recommend reviewing this detailed KB
describing all the nuances of domain controller recovery.