How hard would an open source equivalent of BTSync be to create? This isn't advocacy; it's just a literal question. In a world where everyone uses multiple devi

How hard would an open source equivalent of BTSync be to create? This isn't advocacy; it's just a literal question. In a world where everyone uses multiple devices to access his or her "stuff", it seems as though something as fundamental as secure file sync'ing is going to become fundamental infrastructure in which an open source solution would be strongly preferred. How likely it is to happen soon would depend on how hard it is to do.