In addition to a regular tape backup, RDISK to generate a new ERD, ConfigSafe NT to backup the registry, and RegBack from the reskit, I also use Regedit.exe, The Windows 95 Registry Editor, to backup the registry.
When you start Regedit.exe, My Computer is highlighted. Click Export Registry File from the Registry menu. In the Save in: dialgue box, you can choose anyplace but I press the Up Folder Icon until my Desktop is selected. Type a file name, like Registry, in the File Name box and click Save. Exit Regedit.
To restore the registry, I double-Click the Registry icon on my desktop, but you can simply double-click the .REG file that you saved.