I didn't read all the replies here... but the absolute fastest way to do this would be with SUPER DUPER.

I'd boot machine 2 into Target Disc Mode and plug it into machine 1 that you want to clone. You can instruct Super Duper to make bit for bit bootable clones on machine 2.

It also has scripts you can write (really easy) to sync drives after the fact. check it out, or not

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BEATPORT

more analog, more sidechain