Richard is concerned that his backup won't be safe from the NSA. Leo says that Carbonite is as good as he can get because it has a "trust no one" encryption. Only he has the key to the encryption, not them. So that makes it a good choice.
However, there is a transfer point between his ISP and Carbonite. So the government can always go there and demand the "SSL" keys. And perfect forward security prevents the US government using older keys that are outdated.
(Disclaimer: Carbonite is a sponsor).