As with any big upgrade, make sure to back up your iPhone, iPad, or iPod Touch before updating. How do I back up my Apple device? There are 2 ways of doing this:
1. iCloud Backup – Make sure that you’re connected to Wi-Fi first. Then go to “Settings” and tap on “iCloud.” Select “Storage & Backup” then tap on ” Backup Now.”
2. iTunes Backup – Plug in the device into your computer and make sure iTunes is open. Your phone should be visible in iTunes. Click on the “Summary” tab. There should be a section for backups. Under “Manually Backup and Restore,” there should be a “Back Up Now” button. Click on that and let it back up!