RBU simply means "Registry Back Up" and is a tiny BAT (batch) file that will automatically backup a copy of the Windows Registry and place the backup, as a REG file, on the current user's desktop.
Originally from www.completelyfreesoftware.com/reviews/we_w95_RBU32.html
Uses regedit to export the entire registry into one reg file
Maybe can be used as simple backup process or as part of external tool to compare two reg backup files to watch for changes happened in system.
Added ability to have Machine name, date and time to file name.