There is nothing in the world wrong with me wanting to serve 4 terabytes of content off my own local machine, and know where it is going, and to whom, without t

There is nothing in the world wrong with me wanting to serve 4 terabytes of content off my own local machine, and know where it is going, and to whom, without the involvement of any third-party at the content layer. That is a feasible, realistic, and tangible goal in the current state of things. Dropbox has a lot of data. They're not a file-system vendor; they're a neo-google.