Back up iPhone using iCloud or iTunes
You can back up iPhone using iCloud or iTunes. To decide which method is best for you, see About backups for iOS devices.
Tip: If you replace your iPhone, you can use its backup to transfer your information to the new device. See Restore iPhone.
Back up iPhone using iCloud
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.
Back up iPhone using iTunes
On your computer, open iTunes.
Click the iPhone button, then click Summary in the sidebar.
In the Summary pane, select “Encrypt iPhone backup” if you want to encrypt the backup stored on your computer.
Encrypted backups are indicated by , and a password is required to restore them.
Click one of the following:
Back Up Now: Starts a manual backup.
This computer: Turns on automatic backups that start whenever you connect iPhone to your computer.
To view or delete iTunes backups, choose iTunes > Preferences, then click Devices.
If you need more help deciding whether to back up iPhone using iCloud or iTunes, see the Apple Support article About backups for iOS devices.