What Happens If You Delete the Domain Controllers OU, and How Can You Restore It?

Start polishing up your resume, because if you don’t have a lag domain controller, you’ll need to restore from the last known good backup. That’s your best bet.

If the OU gets deleted, it likely means the computer accounts for all domain controllers are gone too. You'd want to check if the Active Directory recycle bin is enabled. If it is, head to the Active Directory Administrative Center and try restoring it from there. It's crucial to act fast to prevent any syncing issues from spiraling out of control. If that route doesn't work, you might have to shut down all domain controllers, restore one from a good backup, and then rebuild the others.

You'll want to do an authoritative restore of a Domain Controller from backup. As long as you have backups handy, you should be able to recover from this mess.

It depends on what was inside the OU. Were there any important objects or just empty? Knowing that could change the restore strategy.

Honestly, if the OU is gone, the whole domain might be in trouble. Your best shot now is restoring from any available backups.