Many people complain that the i Phone battery drains very fast than expected after the updating.
You can choose to use i Tunes or i Cloud to get them backed up.
Using Recovery Mode (i Phone 7)Using Recovery Mode (i Phone 6S and Older)Using Cydia on a Jailbroken i Phone Community Q&A This wiki How teaches you how to restore a previous backup on your i Phone without updating it to the latest version of i OS in the process.
An i Phone in recovery mode is almost entirely useless to someone.
Backup Files before Restoring i Phone without Updating The Coolmuster i OS to Computer Transfer (Windows/Mac) is a one-stop shop for any backup and transfer from i Phones, to PC or Mac.
It intelligently transfers data from your device to i Phone/i Pod/i Pad Touch to the computer.