Fling is an FTP designed to make remote backup and folder synchronization painless. Not only can you use Fling to monitor a local directory and sync it to a remote FTP site or remote folder on your network you can also manage and sync local files on hard drives and removable media. Fling integrates with Windows, you can easily send files to remote and local locations using the right click menu. You can set up Fling automatically update and sync files or restrict it to certain times or only when the transfer is manually started. Fling supports secure FTP via SSL and can be run as a service to ensure it's running even when you're not logged in. For other great file syncing solutions, make sure to check out the Hive Five: Best File Syncing Tools. Fling is freeware, Windows only.