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.
Just so you know...
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Back up the memory using iTunes, go to 1a.
Back up the memory using iCloud, go to 1b
1a - Back up the memory using iTunes
Go to www.itunes.com on your computer.
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.
Connect the data cable to the socket at the bottom of your device and to your computer's USB port.
Depending on your settings in iTunes, backup may start automatically.
To start backup manually:
Select Back up to iCloud or Back up to this computer.
Right-click your device in the menu to the left.
Select Back Up.
1b - Back up the memory using iCloud
If it's the first time you use the application, you need to log on.
Press Storage & Backup.
Press the indicator next to iCloud Backup to turn on the function.
Press Back Up Now.
To synchronise the contents of your device continuously, press the indicator next to the required data type to turn on synchronisation.