BitTorrent Sync is a Torrent style synchronizing tool created by Resilio, Inc. It easily allows userss to synchronize files between multiple drives. BitTorrent Sync works much like cloud based storage options. However, it is Peer to Peer. Because of this, your files are only shared on device drives that you have given access to. Rather than centrally stored on some cloud based server. Therefore files might be shared between your phone, tablet, or computers, with your friends, etc. Making for a nice P2P file synchronization tool to bring with you on your USB drive.