As reported by a customer of mine, Roadrunner now has an offline storage option they will let there customers pay for. The idea is that you store your documents as usual on your home PC and then tell Roadrunner what files/folders to back up whenever an internet connection of sufficient bandwidth becomes available. If it really works like this, then we have a pretty slick option.
The problem is space availability (limit 100mb). I suppose if Roadrunner has it then services like it are likely poping up everywhere.
What are some other companies in this business? Some of the companies I work for would pay dearly for services like this. I have one company that only needs about 1GB of offline storage and another that would benefit from several terrabytes and enhanced security.