I'm sure this is a very simple issue, but I can't seem to make sense of things. My iPhoto library is a complete mess. I actually have three libraries, two on my external HD and one on the internal. I have been trying to figure out how to simply move any new pics that I've downloaded on to my internal drive on to the external drive so I have a back up. I was hoping to just select the photos I want to move, then drag them over but it will not let me. Any suggestions to help me keep things backed up and in order?