Question about Itunes album art -- Is there a difference between the way Itunes automatically adds album art from the itunes store VERSES me adding album art to songs? Do both ways embed the art into the aac/mp3 files (thereby adding to the size of the music file)? Or, is art that is added via the music store not embedded but added another way? Itunes was able to find art for about 50% of my music, and I am adding the rest. When I am done, I want to create a backup of all my songs and just want to make sure the art is backed up with it. thanks!