Restoring your site is a simple process if you've previously downloaded a backup of your site through cPanel.
Login to cPanel and choose "Backup" from the system menu. Once inside the Backup menu, you'll be prompted to perform three separate types of backup restorations.
Select the type of backup you wish to restore, click the "Browse" button next to your backup option and direct the file manager to the file on your computer which you'd like to restore.
Once located, click the "Upload" button and cPanel will begin to restore your backup automatically.