Why would you need this? Let me tell you for what I'm using it: on my work computer, most of the ports are blocked, meaning I cannot use a Bittorrent client. I can, however, use a remote Bittorrent client, and then I use the steps described in this article to synchronize the remote Bittorrent download folder with a local folder. Using this, I can basically use a Bittorrent client on my work computer, even though it's a remote one - the files end up being downloaded on my local computer.
Obviously, you can use this for other purposes too, like remote back-up, simple folder synschronization and so on. In this article, I am going to explain syncing the remote folder with a folder on your local computer, but the other way around is possible, just use the same instructions, but replace "local" with "remote" and the other way around, in the steps provided below.