If your ERD is full because the registry is too big :
1. Run RDisk.exe to update your repair information in Winnt\Repair.
2. Open the folder Winnt\Repair.
3. Copy Setup.log, Config.nt and AutoExec.nt on your DRU.
4. For a full backup, the following files are necessary too :
Default._
Sam._
Software._
Ntuser.da_
Security._
System._
Setup.log
5. On your DRU copy what fits on the diskette from the files listed above.
6. Repeat the procedure with as many diskettes as necessary : on each diskette, copy Setup.log, Config.nt and AutoExec.nt as well as what fits from the files listed above until you have a complete set of diskettes.
7. Make as many repairs as DRUs you have copied by booting with Windows NT's installation diskette.