Yes, Rush advertises it on his show. He says he personally uses it. It might also be advertised on his website.
Yes, but I'm unsure of what he actually means. He endorses Carbonite, and he talks about using backup, but I'm not positive that he actually says that he uses Carbonite for backup. And the main reason I'm suspicious about that is that Rush uses Macs - and Rush himself said that Carbonite will make its service available to Mac users next year. I just hope that the service is dependable considering that people put so much personal data on their computer, and are potentially making it all available when using Carbonite.