Does iCloud Drive Use Mac Storage? Part 2. If you have been saving almost all of your files to the iCloud drive, you should still have a good amount of space on your Mac, right? After all, you have been using the Optimize button to keep everything stored in the cloud and removed those purgeable files already.Īrticle Guide Part 1. In the first place, iCloud Drive taking up space on Mac shouldn’t even happen at all. Is your iCloud Drive taking up space on Mac? Of course, it is and it’s probably taking up more space than it should.