When you're setting up a central storage for all your home content, 100GB is nothing -- you need to start speaking in terms of TB's. So, for now, the best thing is to do local=realtime, and cloud=selective backup/cache.
I've set it up like this using Windows Home Server. I use a few backup services to point it to some of the folders on the server that are important to me (my work folder for instance).
WHS has the ability to stream remotely, and I haven't found any speed issues doing so from my local network. I would like what you're describing, which is local=cache and cloud=realtime, except technology isn't there yet -- disk space in the cloud is still too expensive and ISP <-> home bandwidth still too slow/throttled/capped.
I've set it up like this using Windows Home Server. I use a few backup services to point it to some of the folders on the server that are important to me (my work folder for instance).
WHS has the ability to stream remotely, and I haven't found any speed issues doing so from my local network. I would like what you're describing, which is local=cache and cloud=realtime, except technology isn't there yet -- disk space in the cloud is still too expensive and ISP <-> home bandwidth still too slow/throttled/capped.