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SpiderOak does all of the above. Your data is encrypted end-to-end.

https://spideroak.com/engineering_matters

They cannot peek.

Also, my favourite feature: The client allows you to mirror the encrypted blocks to a remote FTP/SFTP target owned by you.

There's your N+1.

Talk about a zero-trust environment!

So, crashplan and backblaze don't work for you? The previous poster has a problem with them because he is running on an embedded Linux platform that has chosen to omit support for an useful system call from their kernel.

Tarsnap? I haven't used it personally, but the guy seems open and honest about the product. It's open-source and runs on Linux (but you have to compile).

yes ive looked at that, but its double the gb/month cost of S3 and S3 has no inbound traffic cost