Microsoft Knowledge Base Article 216993 contains the following summary:
Windows Backup, the backup tool included in the
Administrative Tools folder on Windows 2000 servers, can back up and restore
the Active Directory on Windows 2000 domain controllers. These backups can be
performed while the domain controller is online. You can restore these backups
only when the domain controller is booted into Directory Services Restore mode
using the F8 key when the server is starting.
If a non-authoritative restore is performed using Backup, the domain controller will contain the settings and entries that existed in the Domain, Schema, Configuration, and optionally the Global Catalog Naming Contexts when the backup was performed. Partial synchronization (replication) from other replicas within the enterprise then update all naming contexts hosted on the domain controller, overwriting the restored data.
For additional information about authoritative and non-authoritative restores, please see the following article in the Microsoft Knowledge Base:
If a non-authoritative restore is performed using Backup, the domain controller will contain the settings and entries that existed in the Domain, Schema, Configuration, and optionally the Global Catalog Naming Contexts when the backup was performed. Partial synchronization (replication) from other replicas within the enterprise then update all naming contexts hosted on the domain controller, overwriting the restored data.
For additional information about authoritative and non-authoritative restores, please see the following article in the Microsoft Knowledge Base:
216243 Authoritative Restore of Active Directory and Impact on Trusts
and Computer Accounts
Windows 2000 prohibits the restoring of old
backup images into a replicated enterprise. Specifically, the useful life of a
backup is identical to the "tombstone lifetime" setting for the enterprise. The
default value for the tombstone lifetime entry is 60 days. This value can be
set on the Directory Service (NTDS) config object.
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