Last time I did such an animal, I used tar + gzip (really slow when you have 2G+ data on /usr), did a fresh install on the new system, then extracted all the .tgz archives, and a reboot. Done.
Dump is probably better though. I must have been drinking too much when I thought tar would be a good idea.
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I just saved a bunch of money on my car insurance by fleeing the scene of the accident!
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