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Before updating your phone's software, it's recommended that you back up the phone memory to ensure that no data is lost. It can also be useful to back up the phone memory regularly to ensure that no data is lost in case of defects and crashes. Follow these instructions to back up the phone memory.
Before you can back up the phone memory, you need to activate a Google account in your phone.
Find "Backup & reset"
Press the menu icon.
Press Backup & reset.
Back up phone memory
Press Back up my data to turn on back up.
When the box next to the menu item is ticked (V), the function is turned on.
Press the home icon to return to standby mode.