Update – November 11, 2014
Until recently I regularly used and wholeheartedly endorsed FreeFileSync. Recently, however, the developers have bundled the software with browser hijacking malware that installs itself when you attempt to install the software. As such, I no longer use or recommend FreeFileSync.
FreeFileSync is a free and open source tool for syncing directories and files. I use it primarily to mirror my main personal data drive — which clocks in at about 3 million files in 1.1 terabytes — to a local backup.
In the past, I’ve actually paid for commercial sync tools and this blows them all away. It tears through the compare and sync very quickly, and is extremely configurable if you want to go beyond simple mirroring.
I rely on this daily, and the best praise I can give it is that I just hit the Synchronize button and forget about it.
