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I doubt this increase in the attack surface is meaningful. If someone gains control of my device they can in all likelihood initiate a transfer of my files from cloud storage. They can also gain control of the cloud service. But the probability of the latter is too small to consider. When A >> B, A+B =~ A

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if you believe in unbreakable encryption, sure. but i don't. now it's traversing an unknown number of systems, every time you view or edit.

You don't have to believe in unbreakable encryption, just like you don't have to believe in unhackable cloud hosts. You just have to believe in hard enough to break and hard enough to hack. Then you're back to stuckagain's point, slightly revised: When A >> B and A >> C, A+B+C =~ A.

(Ah, that is, you have to believe that the encryption used in all legs of transit is hard enough to break.)

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