Do not be one of those posting on Facebook asking people to tell you their phone numbers because you did not secure your phone – secure your iPhone, iPad, or iPod Touch before pressing the install button foron 17 September.
You can use either iCloud or iTunes to back up your iOS device. Both options have advantages and disadvantages, but at the end of the day, backing up your device can prevent many headaches (and possible heartbreak) should something go wrong when upgrading to iOS 12.
Using the iCloud service from Apple to back up your iOS device is the simpler method. Every iCloud account gets 5GB of free storage for things like backups, so why not?
To force a backup of your iOS device with Apple's iCloud service, go to Settings > tap your name > iCloud > iCloud Backup > Secure Now .
Make sure you're connected to a Wi-Fi network and have a charger handy. You do not want to blow your wireless data plan, and the backup process can chew off a lot of your battery in no time.
Another way to back up an iOS device is to use iTunes. You need a computer with the latest version of iTunes and an Apple Lightning cable.
Connect your iOS device to the computer and unlock it. Enter your PIN code when prompted to approve a connection between the computer and the device.
In iTunes, click your device's small thumbnail next to the Music / Movies drop-down menu.
If the Summary option on the left side is selected, you should see a screen with details about your device. On this screen is also a backups section. Leave iCloud selected, but select Encrypt iPhone . You will be prompted for a password that will be used to encrypt the backup. Whatever you do, do not forget the password you enter – without it you will not be able to restore the backup of your iOS device if needed.
If a password has been entered, click Back up and let iTunes work. A few minutes later you have an encrypted backup stored on your computer.
An encrypted backup prevents you from having to enter account passwords for apps such as email or Facebook when restoring a device, as opposed to iCloud backups that can get hit.