Retro 5.1 & Panther Server

Hello, I've got a Panther Server and Retrospect 5.1. There was a great article here on backing up Postfix and Cyrus mail stores, so I'm good there. First, is Retrospect 5.1 usable, or is there some fatal flaw with the current OS X Server (10.3.5)? Secondly, I need to figure out what to backup for the Open Directory services and file services. Obviously, I'll need to backup the /User directory and the sharepoint, but what about configuration files and such? Steve.