I'm more comfortable on the .htaccess Maker end, the actual .htaccess file is black magic.
You need to put
/administrator/components/com_akeeba/backup.php
in the "Allow direct access to these files" field. Each file goes on a new line if there is already something there. In that field, you only need the path from the root of the site, not the full path.
If that's not it, we're going to have to check the server error log to see if it gives us any clue about what's blocking access to that file.
Dale L. Brackin
Support Specialist
English: native
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!
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My time zone is
EST (UTC -5) (click here to see my current time in Philadelphia, PA)