If you have a lot of hi res pictures, a second HD and a DVD burner make a good option. . I have 2 hard disks in my computer and keep copies of all my photos on both of them, I also have a DVD R/W burner that I use for long term back up. CD's are not really a good option, at least for me because I have lots of photos and I can only get about 200 pictuers on one CD. They are from a 5mp camera take up a lot of space, a 8mp in raw mode would take up a lot more space. It would take me a dozen or more CDs to back up all my pictures now and that grows by several CD each trip. At this time, I can get all my photos on 2 dual sided DVD. I also keep 2 versions of each picture. The original photo as it came from the camera and a second that I have processed in Photoshop. If better software comes out later, I get better at using Photoshop or I want to do something different with the photo, it's best to start from the original. Storing the DVD's off site is not a bad idea either just in case of fire or other disaster.
