What Is System Data on a Mac? First, to check how the storage on your Mac is being used, click the Apple icon in the top left corner of the toolbar and go to System Settings > General > Storage.

How to clear system data on MacOS Clear system cache The system cache is where you'll reclaim the most storage (especially if you've been using your Mac for a while).

By following these steps, you can effectively clear the Quick Look cache on your Mac, ensuring that your system runs smoothly and your data remains protected.