I am what is called a "snowbird." That is, I have a summer home up north and a winter home in Florida. Both locations have computers with very large external USB hard drives. I use BitTorrent Sync to keep more than 500 gigabytes of data in sync at both locations. If a change is made at either location, the file(s) is copied to the other location within a minute or two. I use BitTorrent Sync to securely transfer all sorts of word processing documents, newsletter articles, web browser bookmarks, family photographs, and my collection of Grateful Dead .mp3 music files.
BitTorrent Sync provides the capability to have my files in both locations. If a change is made at either location, it is copied to the other location within minutes. It also provides redundancy for backup purposes: each file is kept both locally and also "off site" at the other location. If I ever have a fire, flood, or a burst water pipe at either location that destroys my computer and the local backups, I always have remote backup copies at the other location. Best of all is the price tag: FREE.
BitTorrent announced on Monday an impressive milestone has been reached for its file synchronization tool called BitTorrent Sync: users have synced over one petabyte (one thousand terabytes or one million gigabytes) of data. The company says over 70 terabytes are synced via the tool every day.
You can read the latest announcement at http://goo.gl/A8O5v. You can also read my earlier article about BitTorrent Sync at http://goo.gl/mXYHs.