I'm using Lightroom and I want to move all my photos off of my internal hard drive to an external drive. I'm clueless when it comes to this stuff. Should I also move Catalog.lrcat and CatalogPreviews.lrdata as well??? All of my photos are taking up space on my hard drive...I want to move everything for that reason and also if I ever have a computer crash, I can just plug in the external drive to another computer with Lightroom and be all set. Thank you. I want to do this but I'm afraid to mess everything up!