When you need to restore some or all of Active Directory, the driver might pick up interim events and perform unwanted actions on the Identity Vault. To restore safely, temporarily disable the driver during the restore operation and then bring the Identity Vault back into synchronization with Active Directory.
Disable the driver.
Delete the Dirxml-DriverStorage attribute on the driver object in the Identity Vault.
Restore Active Directory.
Set the Active Directory driver to Manual or Automatic startup, then select the option.
Start the driver.
Re-migrate to find unassociated objects.