One thing that I don’t think is stressed enough in the Veeam manual is the “Application-Aware” checkbox that is, by default, not checked. Because Veeam (like most other image level backup software) do not do a true system state backup like in the old days, there can be some significant issues if you are restoring an Active Directory domain controller. However, Veeam can compensate for this problem if the “Application-Aware Image Processing” checkbox has been selected. If however you restore a domain controller from a backup and that box was not checked then you run the risk of FUBARing Active Directory replication.
For more information on why the problem happens to check out this Microsoft KB article http://support.microsoft.com/kb/875495
I’m no active directory expert, but I did get to witness what happens when you restore a DC without the Application Aware processing, and I must say that it is not a fun process to fix the problem. The best way to avoid having to deal with the problem is to just check the Application Aware Image processing box.
After you restore a system from a backup that did not have that box checked symptoms include:
- Netlogon service is not running
- Active Directory may not replication between servers
- Event ID 2103 in Event Viewer. ( The Active directory database has been
restored using an unsupported procedure.)
I would encourage you to go through your backup jobs and verify that this checkbox has been checked and that you have valid domain credentials in the proper boxes below it on the same window.