Hi,
Pogoplug works great for me. You own the unit and have custody of the drives at all times.
I also saw something talked about on the Raspberry Pi blog. I think it was called Owncloud or similar and you could build your own.
Due to encryption issues, I would check to see if Spideroak is legal and not blocked in China.
Might Ubuntu One fit the bill too?
Cheers,
Paul.
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