With Crashplan, all data is encrypted before it leaves your machine if you use a private key. The pricing is MUCH better and it's not a single man operation.
If you're paranoid about it being closed source, you can make a quick script to encrypt sensitive data, copy it to another folder, then sync that encrypted folder online. I do something similar with a small % of my data.
As far as server backups, it's trivial to script a copy to your local machine then let Crashplan sync that.
The thing is that Colin Percival has done genuinely novel computer science, real heavy lifting, to make both strong encryption and smart de-duplication possible in the same service.
So far as I know, nobody else has done that.
In practice tarsnap is cheaper than everything else because of the dedupe.
Well you have me there. I'll fall back on the fact that Colin's code is available and that he's published papers covering all the maths and computer science that leads up to being able to dedupe without sending stuff to the server or decrypting on the server side.
If you're paranoid about it being closed source, you can make a quick script to encrypt sensitive data, copy it to another folder, then sync that encrypted folder online. I do something similar with a small % of my data.
As far as server backups, it's trivial to script a copy to your local machine then let Crashplan sync that.