Optimized Storage in macOS Sierra 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.
To begin, 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.
Store in iCloud
Click the Store in iCloud button, then choose from these options:
- Files from Desktop and Documents in iCloud Drive. Store all files in these two locations in iCloud Drive. When storage space is needed, only the files you recently opened are kept on your Mac, so that you can easily work offline. Files that are stored only in the cloud show a download icon , which you can double-click to download the original file. Learn more.
- Photos and videos in iCloud Photo Library. All original, full-resolution photos and videos are stored in iCloud Photo Library. When storage space is needed, only space-saving (optimized) versions of photos are kept on your Mac. To download the original photo or video, just open it.
Storing files in iCloud uses the storage space in your iCloud storage plan. Learn how to manage your iCloud storage.
Click the Optimize button, then choose from these options.
- Automatically remove watched iTunes movies and TV shows. When storage space is needed, iTunes movies or TV shows that you already watched are removed from your Mac. Click the download icon next to a movie or TV show to download it again.
- Download only recent attachments. Mail automatically downloads only the attachments that you recently received. You can manually download any attachments at any time by opening the email or attachment, or saving the attachment to your Mac.
- Don't automatically download any email attachments. Mail downloads an attachment only when you open the email or attachment, or save the attachment to your Mac.
Optimizing storage for movies, TV shows, and email attachments doesn't require iCloud storage space.
Empty Trash Automatically
Empty Trash Automatically permanently deletes files that have been in the Trash for more than 30 days.
Reduce Clutter helps identify large files and files you might no longer need. Click the Review Files button, then choose any of the file categories in the sidebar, such as Applications, Documents, GarageBand, iOS Files, iTunes, or Trash.
- Some categories allow you delete files directly. Move your pointer over the file name, then click to immediately and permanently delete the file. If you purchased the file from the Mac App Store, iBooks Store, or iTunes Store, you might be able to download it again.
- Other categories show the total storage space used by the files in each app. You can then open the app and decide whether to delete files from within it.
Other ways that macOS Sierra helps save space
macOS Sierra automatically takes these additional steps to save storage space:
- Detects duplicate downloads in Safari, keeping only the most recent version of the download
- Reminds you to delete used app installers
- Removes old fonts, languages, and dictionaries that aren't being used
- Clears caches, logs, and other unnecessary data when storage space is needed
Where to find the settings for each feature
- Choose Apple menu () > System Preferences, click iCloud, then click the Options button next to iCloud Drive. Store in iCloud selects Desktop and Documents and Optimized Mac Storage. To turn off iCloud Drive entirely, deselect iCloud Drive.
- In Photos, choose Photos > Preferences, then click iCloud. Store in iCloud selects iCloud Photo Library and Optimize Mac Storage.
- In iTunes, choose iTunes > Preferences, then click Advanced. Optimize Storage selects “Automatically delete watched movies and TV shows.”
- In Mail, choose Mail > Preferences, then click Accounts. In the Account Information section of your email account, Optimize Storage sets the Download Attachments pop-up menu to either Recent or None.
Empty Trash Automatically: From the Finder, choose Finder > Preferences, then click Advanced. Empty Trash Automatically selects “Remove items from the Trash after 30 days.”
- The Storage tab in About this Mac shows purgeable content when you've turned on Optimize Mac Storage. Purgeable content represents storage space that your Mac can automatically make available when needed. Files considered purgeable can always be downloaded again on demand.
- If you're using a pro app and Optimized Mac Storage, learn how to make sure that your projects are always on your Mac and able to access their files.