SpiderOak does all of the above. Your data is encrypted end-to-end. https://spideroak.com/engineering_matters https://spideroak.com/engineering_matters They c

SpiderOak does all of the above. Your data is encrypted end-to-end. https://spideroak.com/engineering_matters 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!