Actually Microsoft has a free, rather nice tool that functions mostly like rsync called SyncToy. It's a native Windows application so you don't need a Windows-compiled rsync like many other tools do. It's GUI based to make is easy for the most unfamiliar of users but it is useful even to the advanced for periodic synchronization of data from Windows hosts to other drives or a network location. It has a built-in scheduler to allow it to function as as service.
(Note: This isn't an MS add. I recently discovered this tool by accident to backup my wife's laptop and was pleasantly surprised it "just works")