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Mee just called me; he seems to have recovered all the data from the server, and now he just needs to restore the computer itself.
The idea of getting a hash of all files and comparing versions isn't new; it was suggested four years ago.
Mee has been pestering me for a year now to provide the details for charitable donations. Among the most pressing needs, I'd like to buy a UPS so the server doesn't crash so often.