We are heavy users of the book feature, and within books use links back to resources, forums and quizzes. When backing up a course, then restoring, the hyperlinks used within books linking to resources at the course level are recreated with new ID numbers. However, the links to quizzes remain hard-coded to the initial course. Basically, this makes is a challenge to backup a course as a template and restore the course to create an entirely new course. The new course keeps its links to the initial course. It seems to only affect links to quiz modules, and not other modules/blocks.