Your Moodle backups are failing because of your current Moodle configuration. The server might timeout and produce an error message or your data directory might not be writable. You can change this by setting the permission for it to 755 from your cPanel -> File Manager in the following way:
-Click on the letters next to the icon of your data folder.
-A little box appears on the top-right side of the page
-Click on Change File Permissions and 7,5,5 in the box with the number below.
Please note that you should change the permission of all files that are under your data directory in this way.
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