In CPanel, you will see BACKUP. Click on the picture to get into the BACKUP section and you will see a choice to either backup your entire public_html directory and/or just your MYSQL databases.
If you want to restore your public_html backup, click the RESTORE button and it will walk you through the process.
If you want to restore your MYSQL backup, click the RESTORE selection after choosing the database to restore.
I find it easier and quicker to use the backup section in CPanel rather than the Magento backup tool.
Hope this helps…