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I'm not sure even encryption helps if you only have a locking screensaver. Both TB and FW devices have DMA so if somebody really wants to get in then the password-protected screensaver lock isn't going to stop anyone (given that the encrypted volumes are mounted).

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I suspect that's a different threat though – at least to me, "smash and grab" implies opportunistic steal-laptop-from-car-and-fence-in-nearest-bar type problems. If you've "lost" a laptop to people capable of and interested in probing your firewire port for in-memory passphrases, you've got a whole other level of attacker. (A level of attacker against which I suspect _most_ startups can't and won't attempt to defend themselves against.)

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