This article about the limitations of RAID (with large enough amounts of storage) sounds like a real call to start backing up. It's dated from 2007 - I'd love to know if there's any reason to think RAID isn't reaching the limits Robin Harris talks about.
In a vaguely related vein, Google's GDrive is getting closer. Time Machine makes Mac backups easier, but it sounds like Google wants to take what Amazon has with S3 one step further and make a bunch of use cases easier. Off site backup is coming within the reach of mere mortals...
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RAID, storage