Login to your cPanel.
Click the Backup button in the Files section of cPanel.
In the Full Backup section, click the Download a Full Website Backup button.
By default, a full cPanel backup will be saved into your account home directory. Go ahead and change Backup Destination if you would like to choose another target location for the backup.
Click on The Generate Backup to proceed.
You will see the following message notifying about the start of the backup generation process.
Click on Go Back to monitor the status of the generation process real time and You can download it.