Final answer:
File History backs up any files that are available offline. It includes documents, pictures, and other user files within designated folders.
Step-by-step explanation:
File History in Windows is designed to back up copies of files that are located in user libraries, desktop, favorites, and contacts. Therefore, File History backs up any files that are available offline. This includes all forms of user files, such as documents, pictures, and any other user files that you've made available offline within the folders that File History is set to back up.