In tip 2102, I described what NTBackup doesn't backup/restore.
After you do a complete restore of a Windows 2000 computer, you are unable to access external storage. Reinstalling your HBA adapters may cause a BSOD, and removal / reinstallation of the multi-path software does NOT fix the problem.
Multi-path software creates a 'virtual bus' to enumerate the devices attached to the HBA controller. Since the HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\ key was NOT restored, the 'virtual bus' cannot be created.
To resolve this issue:
1. Perform a clean install of Windows 2000.
2. Install the correct drivers for the HBA controller.
3. Install and configure the multi-path software.
4. Perform the complete restore.