You might want to tell what backup utility you are using that gives you this message.
Perhaps someone who is using that product may be able to help.
Just an aside.
If I was to copy my registry to a cd and put it in a draw for 30/60 days I have to wonder how much value it would be if I tried to use it.
When I try to backup my registry to a CD, I keep getting the error message "The backup file name cannot be used". "E:\Backup 06-05-04 Registry.bkf". It doesn't seem to matter what file name I use - It just gives me the error message, and I cannot create a registry backup CD. Am I doing something wrong? The backup wizard seems simple enough - until I run into the error message. I know my CD burner is working. I copied another file to a CDRW just to check.