You can easily create a backup of your phpMotion website by simply downloading all of your files via FTP and export your database. You can access your phpMotion files and download these via FTP by following the instructions at:
https://www.tmdhosting.com/tutorials/video/ftp.html
Your CMS MySQL database can be easily exported via your cPanel -> phpMyAdmin following the instructions at:
https://www.tmdhosting.com/tutorials/video/phpmyadmin/phpma-export.html