First thing to solve is access permissions! Users shouldn't be able to do this. (Sorry, I'm sure that's obvious!)
To answer the question, what backup software are you using? The answer depends on how the DB was backed up. If the software is Exchange friendly, it should be fairly straightfoward to restore the file to the original server.
While you're sorting that out, I would run another backup on the remaining folders, as any subsequently received mail will almost certainly get overwritten when you restore.
As well as backing up, you can easily put the new mail aside by setting up a .pst file (a personal folder), move just the new mail to that and when you've restored drop the new messages back in.
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