If you want to backup your website using cpanel, follow undermentioned steps-
Step - 1 - Log in to your cpanel account
Step - 2 - Type "Backup" in the search bar as shown in below image
Step - 3 - Click On "Download A Full Account Back-Up Button"

Step - 4 - Click On "Generate Backup" After Selecting Home Directory as backup destination.

Hence, your backup will be sent to your registered email address in this case "example@gmail.com"
