Once the folders are setup, all you have to do is push a button and the syncronization begins. There are three modes you can use to configure how you sync the folders. The first is Syncronize, which copies changes in both directions. This is what most people will use, as this makes sure all of the data is the same in both locations. The second option is Echo, which copies changes one way only. The last option is Contribute. Contribute mode copies changes one way just as Echo does, except files that are renamed are copied to the destination drive without deleting the previous versions.

SyncToy is not as automatic as it should be. Microsoft has other options like Live Mesh, that tracks changes in folders and keeps files synced without any action on the user’s part. But for those looking for an easy to use utility to keep files in order, SyncToy is for you. We would like to see something like this built into Windows in the future, as mobile devices are becoming more common, but for now SynToy is free and easy to install
article source:http://www.pctechbytes.com/2009/05/27/free-folder-syncronization-software/