Wow, I've never heard of booting from a drive corrupting it. That's quite strange, but it's certainly possible that the chipset is severely incompatible in a weird way. (I haven't heard of StorTecc myself -- we tend to recommend OWC, LaCie and WiebeTech enclosures since they have the best Mac support -- but people have had luck with the Maxtor OneTouch units, too.)
In any case, if the backup completed successfully -- and was a "Backup - all files" backup -- it should boot fine on a compatible device.
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--Dave Nanian
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