Regularly Backup Your Device
Because iOS 9 problems could arise at any time, you'll want to make sure that your sensitive files are backed up at all times. We recommend making regular backups of your phone and of your tablet just in case something happens during your time with the software.
Making a backup is smart and it's also quick and easy. To make a backup, open iTunes. The backup process should begin after you plug your device into the computer. If this doesn’t happen automatically, you can force a backup to happen.
To force a backup go into iTunes, right click on the proper device, and select Back Up. The process will take some time but you'll come away from it with some peace of mind.
We also recommend doing a regular checkup on your iCloud account and storage to ensure that everything is as it should be.