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Before updating your device's software, it's recommended that you back up the device memory to ensure that no data is lost. It can also be useful to back up the device memory regularly to ensure that no data is lost in case of defects and crashes. Follow these instructions to back up the device memory.
Back up the memory using iCloud, go to 1b
1a - Back up the memory using iTunes
Find the download section on the web page to download iTunes.
Download and install iTunes on your computer.
Start the program iTunes on your computer.
Depending on your settings in iTunes, backup may start automatically.
Select Back up to iCloud or Back up to this computer.
1b - Back up the memory using iCloud
If it's the first time you use the application, you need to log on.