Update (August 13th, 2017) : BT Sync has now become Resilio. I’ll be writing a new post about another way to get this to work soon.
Update (August 28th, 2013) : The iOS BT Sync app is now available for download. Try it out!
BitTorrent Sync (BTSync) is a “Private Dropbox” of sorts in that it offers the same functionality (syncing your files across devices) but without going through a third-party’s servers. Mac and Windows clients are available for download and have some nifty features such as one-time share keys and read-only syncing options. The advantage of BTSync is better handling of large files (especially if you sync across multiple devices) and you don’t have your files hosted on someone else’s server(s).
The advantage of Dropbox is that should you lose all your machines that were syncing to Dropbox, you would still have a copy in the Cloud that you would be able to download on a new machine. This is undoubtedly BTSync’s biggest disadvantage if you don’t have at least two machines on all the time. If, however, you have a server, you can set up BTSync on that server thus creating your own “always-on” sync machine that will create a copy of the files you wish to sync immediately. Let’s get started…