BitTorrent Sync is the safest syncing option in our roundup.
BitTorrent Sync is surprisingly easy to set up and use, and it actually works similarly to Dropbox and other cloud-storage services. To get started, download and install the BitTorrent client (available for Windows, Mac OS X, and Linux) on your computer. You can then choose which folder you want to sync, and BitTorrent Sync will provide a "secret"--which is a randomly generated 21-byte key for that folder. To sync the folder with another device, just download and install the BitTorrent client on that device and type in the secret. Any files you drag and drop into this folder will now sync between these two (or more) devices using BitTorrent's P2P protocol.
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