There are already plenty of great free programs out there to sync between local drives, I don't know if I'm allowed to name them on here, but you can just search google for 'file sync software' Bittorrent sync is as the name says, a piece of software to keep multiple devices in sync with eachother Syncing is not a backup, because if you delete a file from your computer, then it dissapears from the backup as well and you've lost that file. With backup software when you delete the file from your computer, it retains a copy of the file on the backup drive for X number of days, or forever if needed
