First let me say thanks for version 4. Now I'm desperately waiting for an ios app I was wondering how the new database works. The size shrunk from 1.2 gb to only 25 mb which is a good thing. but now i found a artwork folder with a whopping 2gb in size. i guess these are the thumbnails but what are the images in the backdrop folder used for? how where the thumbnails saved in the last version?