My solution is quite simple. In The Yacht, I have 6 hard drives (yes, a bit of overkill but that's how much space I need for my videos). Each one has about 100megs dedicated to backup. At the end of each day (or when I shutdown) I have a script that copies just my operating documents (trip sheets, docs, txt files, etc...and any .ini files that I change regularly) to every drive in the computer...that way I know that no matter which drive goes down everything of importance is safe & sound...the media, of course, is backed up on dvds & tapes long before it goes into The Yacht.
Repetetive? Perhaps. But it's better than losing important (or more importantly, irreplacable) documents.