I have been using this Sync tool for over two years now, Sync Toy is a tool developed by Microsoft just for fun. Its not really supported by them but they have made decent improvements with it. Been using it since version 1.4, to 2.0, and now 2.1 which is a huge leap forward in comparison. A lot of features have been added and bugs have been fixed. The best tool I have found to sync drives or folders with lots of files and subfolders inside of it with little issue and lots of customization is Sync Toy. I needed it to Sync the different folders between the WHS Hazmat Server and the WHS Hazard Server. One will balance the other in file storage which won’t require any need for file duplication. It now supports 32 bit and 64 bit operating systems, works locally on a machine and across networks.

The first folder I needed to Sync was my Anime folder which is 2.49 TeraBytes of media, this is to be done across the network. Testing the file transfer it would transfer between 78 MB/s to 86 MB/s between both the machines so I start the transfer earlier in the evening for it end the next afternoon. Overall its the perfect free tool from Microsoft for all Syncing purposes, two-way sync, or one-way sync and lots of other combinations available.

Link: Microsoft Download