MAC File Storage
If I use iCloud Drive, will my documents also be stored locally on my Mac in addition to the offsite cloud storage on iCloud Drive?
iMac 21.5″, macOS 10.15
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By default there will be a local copy on your Mac as well as on iCloud. If you want to potentially save space on your Mac, see the following from Add your Desktop and Documents files to iCloud Drive - Apple Support
(note that it is applicable whether or not you turn on the Desktop and Documents option of iCloud Drive)
If you need more space on your device, iCloud Drive can help. On your Mac, choose Apple menu > System Preferences. Click Apple ID, then click iCloud. On macOS Mojave or earlier, choose Apple menu > System Preferences, then click iCloud. Turn on Optimize Mac Storage. Then your Mac keeps all of your recent files on your computer, but keeps your older ones only in iCloud, ready for you to download when you need them again.