Support

Yes, as long as you enable the remote quotas option and setup your desired quota options.

Enable remote quotas, enable count quotas and set the Count Quotas option to 30. Quick and easy :)

Your version of Akeeba Backup is no longer supported. Please upgrade to the latest version available for your environments.

Please note that older versions of Akeeba Backup may have had bugs which have long been resolved. Unless you are using Joomla! 1.5 with Akeeba Backup 3.4.3 or Joomla! 2.5 with Akeeba Backup 3.5.1 I can not provide support for potential bugs.

You can upgrade to Akeeba Backup 3.3.13 manually. It's very easy! Download 3.3.13 from its download page. Now go to Extensions, Manage Extensions and use Upload and Install to install this version. If you get an error, just disable the System - System Restore Points plugin and retry. Afterwards try running a new backup and send me the backup log file. This will tell me if it's a known bug or we can apply a workaround to a possible server restriction.

Now, regarding you still using Joomla! 1.7.3. You probably want to get your site hacked! I mean, you're using Joomla! 1.7. This is an OBSOLETE and INSECURE version of Joomla!. I have a friend who is not a developer. He was able to follow the widely published instructions and hack into a Joomla! 1.7.5 site in 5 minutes, using nothing but Firefox and Firebug. Since you have no plans on upgrading away from a grossly insecure, outdated and no longer supported by the Joomla! project version of the CMS you have to expect your site to get hacked very soon. In this case not being able to delete older S3 backups is the least of your worries. If someone spends the necessary 5 minutes to hack into your site using the method I linked to above he can go into Akeeba Backup's configuration (fully editable visible to him as he's now a Super Administrator) and see your S3 access and secret key in the page's source. From that point you are completely screwed as the attacker has full access to your site, your backups and your Amazon S3 account. So please remember this warning:
If you continue to use Joomla! 1.7 despite my express concerns on its lack of security I am not to be held responsible in the very likely event that you get hacked and the attacker gains full access to your Amazon S3 account.

You're welcome! I am trying to raise awareness to the fact that using outdated software is like opening a very big backdoor to hackers. After all, most people know me because of my security talks around the world :)

Thank you!