When you want to clear up disk space on Mac without deleting files that matter to you, then you should first use the built-in Storage Management tool to check out all the big files and recommendations. You can free your local storage by moving photos, videos, and documents to iCloud or an external drive. Another way to clear up space is by emptying the Trash and getting rid of duplicate files from the Downloads folder. Besides this, clearing browser caches, system caches, and old log files can be done safely. Also, when you uninstall apps that you do not use, make sure to keep data associated with these apps backed up. In addition to the above steps, if you switch on Optimize Storage, your system will allow you to automatically get rid of media that you have watched and old attachments, which will help you to reclaim space without the need to remove any essential files or personal data.