Chuck,
The Joomla! 2.5 series is no longer supported in the most current versions of Akeeba Backup. The 4.1.2 release was the last version that supported 2.5. You can find that release
here.
Your next problem is your PHP version. The 5.3.x release is end of life and unsupported by the PHP project. Bugs and security vulnerabilities are no longer being fixed in that version. The latest version of Akeeba Backup requires PHP version 5.4 or higher. The last version to support your PHP 5.3.28 was version 4.2.4, available
here.
I am not familiar with your host but it is common for commercial hosts to have higher versions of PHP available and use an older version for their default. Depending on the host, you may be able to switch your PHP version on the account level or at the site level, usually in the .htaccess file. Your host would be able to give you more information on what is available and how to implement it. I would strongly recommend that you move off of the PHP 5.3 version.
If you need more information about what version goes with what, you can look at the Compatibility page here:
https://www.akeebabackup.com/compatibility.html.
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)