If you’re running Mac OS Sierra or later, you can save space on your Mac by optimizing storage and storing some of your content in the cloud.
Here’s how to use it. Click the Apple menu and then About this Mac.
A window will open with an overview of your Mac. Choose Storage.
Your first option is Store in iCloud. Choose this option, and, when space is needed, your Mac will save files, photos, movies, email attachments, and other files to iCloud automatically. When you open the file, it will download automatically. Recently used files and optimized photos will remain stored on your hard drive.
Choose Optimize and any iTunes movies and shows that you’ve already viewed will be removed from the Mac. You can always download them later if you want to view again.
Turn on Empty Trash Automatically and anything that’s been in the trash more than 30 days will automatically be erased.
Reduce Clutter allows you to sort through documents and other files and delete what you don’t need. Click it, and you can view apps, documents, books, photos and other files and choose what to delete.