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If your worry is with data at rest, then owncloud already supports it (http://doc.owncloud.org/server/7.0/user_manual/files/encrypt...).

I host my servers with AWS so I use Gluster encrypted bricks with backups to a S3 bucket as well as the built-in encryption capability from Owncloud.

Yeah, but:

> You don’t have to do anything special, as it uses your ownCloud login as the password for your unique private encryption key.

So the server can decrypt my files at will, since it has access to my plaintext password.

SX has client-side encryption if you use the SX tools (sxcp) to upload/download your files to volumes that have encryption enabled: http://blog.skylable.com/2014/09/transparency-reports-server...

Disclaimer: I'm a co-founder of Skylable

Looks very interesting, I'll have a better look at the product tonight.