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Academics with laptops are the worst offenders. Had a boss about that time get a nasty file-corrupting virus with over three years worth of work on an un-backed up laptop. I spent three days on it (OK, half a day finding a tool to dredge through the disc, 20 minutes to start it up, another day of actually salvaging files, and the rest of the time spent explaining back up resources that they were ignoring).