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For backup I always use optical disks. Copying to another HDD isn't a terribly safe method to backup, as you've already discovered. A power spike on your PC can take out 2 magnetic drives as easily as one. I'll take optical backup over magnetic any time. I have never had an optical disk fail to read despite having backups from when CD burners were only double speed. The only optical medium I have experienced problems with are rewritable disks and then only when using InCD or similar sequential writing software. If you're paranoid about your optical disk backups failing over time re-copy them every year or so.
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