I got this marketing email from Mozy.com (no affiliation), which makes another strong case for online backup:

Quote:
Greetings,

Paul Jorgensen and Bill Wiley were each returning from business trips when they boarded US Airways Flight 1549 with their laptops and belongings. Suddenly a routine flight home turned into chaos when the plane crash-landed into the Hudson River. Both travelers abandoned their personal belongings and fled for safety.

Paul Jorgenson’s computer automatically backed up online with Mozy the night before the crash, allowing him to restore all his data the same day. Bill Wiley, on the other hand, backed up his two computers to thumb drives which were also lost in the crash, permanently losing 250 GB of his employer’s information. The stories were detailed in USA Today and ComputerWorld...
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If you're reading this, it's too late.