So I back up my music, docs, etc onto a hard drive.

Is there a lightweight, free program I can use so I don't have to copy the whole lot all at once whenever I have something new (I have a lot of music and am always adding bits here and there).

remember you can merge folders, so my copying it to the same folder as before will simply copy the new folders

I did think there must be a simple way of doing it - hitting it with a stick and my penis produced zero results.

I'll have a look at the link Sen.

Thanks both!

viewtopic.php?f=30&t=6165

I think one of frog's posts contains a file synching tool that I used to use, but I am not entirely sure.