Yes, you can use a drive to boot another computer as long as that computer was released *before* the OS version that's on the other computer. Should work fine: just do a full backup ("Backup - all files"), name it the same as the internal drive, boot from it, check it CAREFULLY, and all should be well.
(You name it the same as the internal to ensure that aliases resolve to the proper (boot) disk. That way the OS won't accidentally launch programs, etc, from the non-boot volume.)
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--Dave Nanian
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