iCloud: Back up your iOS device to iCloud
iCloud automatically backs up your iOS device information daily over Wi-Fi when your device is turned on, locked, and connected to a power source.
Back up automatically
Go to Settings > iCloud > Backup, then turn on iCloud Backup.
Back up manually
Go to Settings > iCloud > Backup, then tap Back Up Now.
For information about messages that may appear while backing up, see the Apple Support article If iCloud Backup couldn’t be completed or you can’t restore.
Important: If you don’t back up your iOS device to iCloud for 180 days or more, Apple reserves the right to delete your device’s iCloud backups. For information, see iCloud Terms and Conditions.