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A nonauthoritative restore of Active Directory (AD) is the default restore mode for Windows Backup and most third-party backup utilities. It is commonly used in cases where there has been a hardware or software failure on the server, or where Active Directory must be restored and then updated by authoritative versions of the AD database running on other domain controllers (DCs) in the forest. Any needed updates to AD on the restored DC are automatically replicated once the restore operation has completed.
Log on to the DC that you want to restore with a domain administrator account:
Wait a few minutes for the DC to reboot. You can log on locally or remotely, but remember that you will need to supply the DSRM password you set when promoting the server to a DC. The username for DSRM is administrator. If the server is booted in safe mode, this will be displayed on the desktop.
Wait for the recovery process to finish, it may take some time. You’ll be able to see the progress in the PowerShell console.
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