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Remember what I've been saying about the relative growth rates of storage and network bandwidth?
As I mentioned recently in a comment to a post on Groklaw, the bandwidth of a carrier pigeon is nothing to sneeze at. If you figure that a bird can carry two SD cards, which are up to 4GBytes these days, then a 1-hour trip will carry north of 8MBits/sec, or about 8 times the bandwidth of a T1 line.
I'm still waiting to hear that Google is trucking data around to synchronize their server farms. A couple of years, I'd guess.