Recovering a domain controller
If the domain controller is not able to boot, refer to one of the following sections, depending on the number and availability of domain controllers in your environment:
Recovering Active Directory data
If the Active Directory database files or the SYSVOL folder are corrupted but the domain controller is able to start in normal mode, you can recover only the Active Directory data.
Use one of the following methods:
This is just a replication of all the Active Directory data from other DCs.
This method enables you to recover all the Active Directory data regardless of availability of other DCs. If other DCs are available, you can also perform an authoritative restore of individual Active Directory objects. For example, you can restore an unintentionally deleted user account or computer account. Other objects will be replicated from other DCs.