[zed716]

There used to be something that worked exactly in this manner, called AeroFS -- There was a website portion that worked just like Dropbox did, and then a client you could install on your systems, and it would distribute items in a torrent-like manner between clients. It had a lot of neat features. It's a shame that it didn't end up really going anywhere (in a very crowded field at the time), because it worked great and they had an on-prem solution that worked really well.