iCloudBackup Without Wifi
What if you don’t have wifi?
You can still back up your iPhone or iPad to iCloudwithout wifi. Just make sure your device is connected to a power source.
To back up your device using iCloud, open the Settings app and tap on iCloud. Then, tap on Backup. Make sure that the iCloudBackup toggle is turned on.
Your device will start backing up to iCloudas soon as it’s connected to a power source.