When you set up your iPhone for the first time, you’re prompted to create a backup password. If you don’t create a backup password, your device will back up to iCloudautomatically when it’s connected to a power source and Wi-Fi.
If you forget your backup password, you can reset it using your Apple ID.
To back up your iPhone using iCloud:
1. Connect your device to a power source and Wi-Fi.
2. Tap Settings [your name] iCloud.
3. Tap iCloudBackup.…