I want to backup my audio collection to another hd on my network. The problem I'm having is that I've already backed it up before and I have new files. I really don't want to wait 10 hours to write over all the files again. I store my music in folders Music>Artist>Album. I've already manually went through all the artist folders and added the new ones but I want to make sure I didn't miss anything. Is there a way to transfer only the files\folders that don't currently exist without replacing the whole artist folder or check the hds against themselves?