I'm about to install a new OES2SP2 server into an existing (OES1SP2) single server tree. I would like to know how I can prepare myself if a a disaster occur.

Can I simply shutdown nds and take a copy of the dib on my existing OES1SP2 server, then start nds and install the new OES2SP2 server into the tree and if something goes wrong then I could simply restore the dib and everything would be as it was before I installed the new server into the tree?