So BT Sync is a piece of software where you install it on 2 different computers, specify the folders you want to synchronize and a shared key and voila, the folders are sync’d.
Its sorta like Dropbox in a sense that it lets you sync 2 computers, but without the use of the external server in between. They have client software for all the different platforms.
I tested with a 5gb file with a friend and it sync’d in about 12 minutes. Awesome speed.
Check it out: