As with anything, there are multiple solutions so I'll suggest just one. I would think your best option is to use a .NET language, C# or VB, both similar, C# is slightly better but VB is slightly easier. So pick one and download the applicable language from the Visual Studio Express downloads page:
http://www.microsoft.com/express/Downloads/Download-2010.aspx
Once you have that, create a simple app with a FileSystemWatcher in it. This is essentially a function to watch a file and when a change occurs to it, it will do whatever you've programmed it to do, in this case take a copy of the file whenever it is changed. More informative info on the FileSystemWatcher class here:
http://www.eggheadcafe.com/tutorials/aspnet/fd3891ed-db38-4149-83a2-95a3a49868b5/how-to-use-filesystemwatc.aspx
Hope this helps, Dai
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