From our Supervisor FAQ.
Please note that after you copy the repository and create the new BOMain.key – it is CRITICAL that you immediately log into the new security domain, and change the connections of your Document and Universe domains there to point to the new repository – or else you will get cross-linked repositories – a total mess that is unrecoverable except for a complete restoration.
Anita Craig 
(BOB member since 2002-06-17)