There is little worse that coming to a support community with a legitimate question only to be chastised by a high-handed user who offers no actual solution.
Have you not learned the importance of civility?
They will only be where you put them.
It has always been very basic to always maintain a backup copy of your computer.
You get one download of audiobooks. Apple has been very kind to allow you to redownload. Have you not learned the importance of backing up your content yet?