I'm not sure if it is "zero-knowledge" or just "little-knowledge" (file meta-data might be transmitted. I honestly don't know), but I've had very good luck with Copy, which was created by Barracuda (the company that's always advertising in airports, for some reason).
Check them out: https://www1.copy.com/home/
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I'm not sure if it is "zero-knowledge" or just "little-knowledge" (file meta-data might be transmitted. I honestly don't know), but I've had very good luck with Copy, which was created by Barracuda (the company that's always advertising in airports, for some reason). Check them out: https://www1.copy.com/home/