does this have client side encryption? they only mention login/password which doesn't really explain anything
Well, duplicity can usually use it. You may have connection problems, because hubic.com is TLS version-intolerant; it'll only use TLSv1.0 (and does NOT negotiate with TLSv1.1/TLSv1.2) with AES-256, AES-128 or 3DES, with RSA and no forward secrecy.
Not what I wanted to see.