I have just completed my first ever cPanel backup and thought i Would share the process in case others like me didn't know it could be done.
It was easy to perform and the only problem I found was that I didn't get an email when it was finished, but I now have a full back up of my cPanel should anything ever go wrong.
Log-in to your cPanel and follow the instructions.
Click "Go Back" to see your backup. I did not get an email even though I said yes, but it was there.
Now you have a full copy that you should keep in a safe place. You can give it to your host if you need your cPanel restored.
*Once you have the download don't forget to delete it from your Home directory as it will take up disk space and is of no use to you sitting there. You will also want to remove it from your Trash if you didn't skip the option to keep in Trash.
I'm no expert but I hope this will help someone like me.
Thank you to starki for the basics.