Learn how to manage and free up space on your Mac using built-in macOS tools.
Optimized Storage in macOS Sierra and later can save space by storing your content in the cloud and making it available on demand. When storage space is needed, files, photos, movies, email attachments, and other files that you seldom use are stored in the cloud automatically. Each file stays right where you last saved it, and downloads when you open it. Files that you’ve used recently remain on your Mac, along with optimized versions of your photos.
Choose About This Mac from the Apple () menu, then click Storage. You’ll see an overview of your free space and the space used by different categories of files, including apps, documents, and photos.
Click the Manage button to see recommendations for optimizing your storage. You’ll see fewer options if some of them are already turned on.