If you have ever installed Joomla to a database already used for a previous Joomla install AND in doing so have selected the option to backup existing tables in that database, those databases will continue to use up space on your hosting account for no purpose. Also, while they remain, the old information in them is vulnerable to exploit by hackers should your site be compromised. How to remove BAK_ backup tables from your Joomla Database is what today's #maintenancemonday is all about.