backup

A copy of important data that includes information, such as the layout of the Home Screen, app data (such as Safari bookmarks and Calendar events), anything you can set in Settings on the device (including restrictions, certificates, and some account types), contacts, and the Camera Roll (but not photo albums). Backups don’t include apps or media that you might usually sync using the Finder (macOS 10.15 or later), using iTunes (macOS 10.14 or earlier), or by storing in iCloud or iCloud Drive. A backup of an unsupervised device is identical to and interchangeable with a Finder or iTunes backup, and you can restore it only to an unsupervised device. Similarly, you can restore the backup of a supervised device only to another supervised device.