Computer recovery method:
Connect iPhone via usb cable and open iTunes.
After connecting the iPhone, click Restore Backup.
ICloud Restore Backup: (You can use iCloud to restore backup only after upgrading the system or restoring all settings)
Click "Settings", find "Restore", select the first "Restore all settings" and restart the device.
Then follow the steps to set (language, region, location, network). When prompted to restore the backup, select the second "Restore from iCloud Cloud Backup" and enter your own Apple id.
Enter the page for selecting backup time. From top to bottom, it is the latest backup, the second new backup and the earliest backup. Just choose what you need.