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.
How to back up with iCloud. Connect your device to a Wi-Fi network. Go to Settings your name, and tap iCloud. If you’re using iOS 10.2 or earlier, go to Settings, then scroll down and tap iCloud. Tap iCloud Backup. If you're using iOS 10.2 or earlier, tap Backup. Make sure that iCloud Backup is turned on. Tap Back Up Now. Go to Settings your name iCloud iCloud Backup. Turn on iCloud Backup. To perform a manual backup, tap Back Up Now. To view your iCloud backups, go to Settings your name iCloud Manage Storage Backups.To delete a backup, choose a backup from the list, then tap Delete Backup. How can the answer be improved?
Back up automatically
On iOS 10.3 or later: Go to Settings > [your name] > iCloud > iCloud Backup, then turn on iCloud Backup.
On iOS 10.2 or earlier: Go to Settings > iCloud > iCloud Backup, then turn on iCloud Backup.
Back up manually
On iOS 10.3 or later: Go to Settings > [your name] > iCloud > iCloud Backup, then tap Back Up Now.
On iOS 10.2 or earlier: Go to Settings > iCloud > iCloud Backup, then tap Back Up Now.
For information about messages that may appear while backing up, see the Apple Support article If you can’t back up to iCloud or restore from iCloud backup failed.
Manual Backup Mac To Icloud Drive
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.