Develop fully automated, easy to use, customizable backup script for multiple Joomla! (1.5, 2.5, 3.0) and WordPress websites

I need a fully automated, easy to use, customizable backup script for backing up multiple Joomla! (versions 1.5, 2.5, 3.0) and WordPress websites. I have Akeeba Backup installed on all my Joomla! sites and XCloner installed on all my WordPress sites. This is what I currently use, but it can be changed if necessary. I would like full website backups (files and databases) to be automatically generated on a weekly basis of all of my websites, and have the backup archives downloaded to my Google Drive or Dropbox automatically. The automated backup script should be written in PHP, if possible, however if it needs to be written in another language such as Perl, Java, etc., I am open to other solutions.