That's what I've been wondering -- just because a 2TB card is supported doesn't mean that they can actually be built. I'm sure there's a hard limit on how much flash memory you can cram into the microSD form factor. Anyone know what that limit is?
When I first saw this project on KickStarter, I checked to see the current capacity of MicroSD and it was around 64GB. Not sure if it's likely to remain at that level for some time.
Even at that size, it could be worth trying to set one up with TimeMachine to give a second copy of critical files in case of hard drive failure in your laptop. Not quite off-site back-up though.
Even on-site would be better -- theft or physical damage would easily render such "in-place" backup moot. Better than nothing though, I suppose -- and I will readily admit that SD cards are quite tough (http://news.bbc.co.uk/2/hi/technology/3939333.stm).
Thing is, the nice snug fit of this device (its entire appeal) goes against frequently taking it out to store elsewhere.
I guess you could use it with two MicroSD cards to alternate back-ups, storing one at home, one at the office. But then the sole advantage would be that during the day, you're not bumping into it sticking out of your computer. I don't move my laptop around during the day often enough for that to be an issue.
