Hi, what you want is software to do folder synchronisation. There are several options, depending on what you want exactly (free or paid) and totally automatic vs manual.
Syncback has a good reputation, and has free and paid option:
http://www.2brightspa...yncback/compare.html.
DSynchronize will automatically synchronise:
http://dimio.altervista.org/eng/. I've not used it personally so can't vouch for it, but it's worth a try.
I use Synctoy myself. It's very easy, decent interface and is from Microsoft so has nothing nasty in it and comes in both 32 and 64 bit versions:
http://www.microsoft....details.aspx?id=15155
Mike