Hello, Well to make it short and simple... everyone knows when you install itunes for the first times it ask you if itunes can modify the original music files or not. When i install it i choose not to then after some month of iphone 3g owner i have made a lot of changes in my library in Itunes. Ok now i want to back up my computer and i have annn huge collection. I always transfer all the files to another pc so i can tranfer back. My questions is how i can make itunes to do all the changes i made on itunes library to the original files? Thanks i will be grateful.