If you already have a Joomla site with existing content, you can still install and use the Sparky Framework. However, if your site is in the production status, it’s recommended to create a mirror copy of your site and work on it.
As you probably know, the content for each Joomla site comes from articles or components (main content), modules (in one or multiple module positions), and menus. After installation of Sparky, your job will be to create layout that will be based with the content elements that you already have. It’s easy with Sparky’s drag’n’drop layout builder.
Once you accomplish that, you can enjoy all features that comes with Sparky to enhance your existing website.