How do I sync a local direectory with one on my web site?

[Geek-9pm]

I was thinking about just overwriting the whole directory, but maybe it would be better to use some kind of program that will synchronize the local and remote directory (folder).
Does that make sense? I have never done that over the internet. Is there some kind of FTP  thing that will make sure only new or changed files are written to the remote folder? Any thoughts welcome. 

[DaveLembke]

Batch file could be used to test between 2 locations for newer files and replace older with newer.

Ages ago I used WS-FTP, which I suppose could be used with a keyboard/mouse macro to update between PC and Host.

You could then then add it to the PC as a scheduled task to update on a regular basis a long as the PC is on to perform the scheduled task at the set time.