It's not that it's not relatively easy. You can do it as long as you're willing to start up from the external drive before you "sync back" to the original computer. But we don't do "two way" sync, so you have to make sure you don't use the other computer before you re-sync... and, as I said, this sounds like a situation where it'll be easy to be tired and make a mistake...
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--Dave Nanian
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