This shouldn't be too tough. :) By default, Akeeba requires Super Administrator access. You aren't logged in as an SA and you're getting the 403. You can change the required access level in the Parameters icon in the upper right corner of the Akeeba Control Panel screen, but you have to be an SA to do that. Don't be too quick to reduce the access level, there is a lot of sensitive information in a backup. You can't give an access level (administrators, managers) access to do a backup without giving them access to download it.
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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