The problem with NT backup is that you can only restore the entire store, rather than a specific mailbox or message.
RE your other question, re versioning - have you thought about using a version control system or document management system to do it? Neither of these is going to be cheap, but it does make it possible to keep versions of files. You might find Sharepoint Portal Server might be what you are looking for. It also stops two people editing the same file at the same time...
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who hid my keyboard's PANIC button?
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