Back up and restore an iOS device
If you back up your iOS device, you will have a copy of your information if your device is replaced, lost, or damaged. See How to back up your iPhone, iPad, and iPad touch for instructions on how to back up your device using iTunes and iCloud.
See Restore your iPhone, iPad, or iPod touch from a backup for instructions on how restore your device from a backup in iTunes or iCloud.
Back up and restore an Android device
Google provides backup solutions for most owners of Android One, Nexus, and Pixel devices. Users of Samsung or other brands can look to the manufacturer’s or carrier’s websites for possible solutions.