While I agree in general, I think rsync's case is special: Unless the file encryption on their side is somehow derived from the SSH connection (so the files are only readable by your connection and while you're connected - is such a thing possible?), it would mean that they have to store the encryption keys somewhere. The far better approach is to treat them as completely untrusted and only store content you locally encrypt before sending it over. That way you don't have to care about them encrypting your data, it's completely in your control. I use restic for that. Works great.