Optimize storage space on your Mac
macOS can help make more room on your Mac by optimizing its storage. When space is needed, it keeps files, photos and videos, iTunes movies and TV shows, and email attachments in the cloud and makes them available on demand. Files won’t take up space on your Mac, and you can download the original files when you need them. Recent files and optimized versions of your photos are always on your Mac.
To view recommendations and decide how to optimize storage on your Mac, choose Apple menu
> About This Mac, click Storage, then click Manage.macOS calculates how much space is being used by different categories.
Note: Wait until all categories are finished being calculated to ensure you’re seeing the accurate amount of space. Values are refined as each category is calculated.
Recommendation
Description
Store in iCloud
Helps you store files from your Desktop and Documents folders in iCloud Drive, store photos and videos in iCloud Photo Library, store Messages and attachments in iCloud, and optimize storage by keeping only recently opened files on your Mac when space is needed.
See Store your desktop and documents in iCloud Drive, Use iCloud Photos to store, share, and manage your photos in iCloud, and Use Messages in iCloud.
You can modify these settings later in iCloud preferences, Photos preferences, and Messages preferences.
Optimize Storage
Helps you optimize iTunes and Mail attachment storage. When space is needed on your Mac, watched movies and email attachments are automatically removed from your Mac.
See Optimize your storage space and Mail Account Information preferences.
You can modify these settings later in iTunes and Mail preferences.
Empty Trash Automatically
Automatically erase items that have been in the Trash for more than 30 days. You can modify this setting later in Finder preferences; see Delete files and folders for information.
Reduce Clutter
Quickly find files, apps, books, movies, and other items that are taking up space, then manually delete items you no longer need. For instructions, see Find and delete files.
When space is needed on your Mac, macOS also clears caches and logs that are safe to delete, including temporary database files, interrupted downloads, staged macOS and app updates, Safari website data, and more.
Note: If your disk is partitioned, recommendations apply to only the partition that contains your home directory.
To see an overview of used and free disk space, choose Apple menu > About This Mac, then click Storage. See available storage space.