Access your iCloud content on your Mac
iCloud is the easiest way to make sure all your important content is everywhere you are. iCloud stores your documents, photos, music, apps, contacts, and calendars, so you can access them anytime you’re connected to the web.
You can use your Apple ID to set up a free iCloud account, which comes with 5 GB of free storage space. Purchases you make from the iTunes Store, App Store, Apple TV app, or Book Store don’t count toward your available space.
iCloud keeps everything up to date on your devices. So if you have an iPhone, iPad, or iPod touch, just sign in to each device using the same Apple ID, turn on iCloud, and you’ll have everything you need.
For system requirements about devices that support iCloud, see the Apple Support article in the Dock, click Apple ID > iCloud, select iCloud Drive, click Options, then select “Desktop & Documents Folders.” To learn more, see the Apple Support article Store and share photos using iCloud Photos and Shared Albums. Store your photo library in iCloud and see your photos and videos, as well as the edits you make to them, on all your devices. Share photos and videos with only the people you choose, and let them add their own photos, videos, and comments. To get started, click the System Preferences icon 
in the Dock, click Apple ID > iCloud, then select Find My Mac. See the Apple Support article What is iCloud? in the macOS User Guide.
