Our practice is to copy the projects to iCloud Drive as an additional backup to local.
On the Mac, macOS creates the iCloud Drive folder "QuickPlan." The QuickPlan app runs in the sandbox environment, which has permission to create the "QuickPlan" folder directly at NO. If you can't find the folder on your Mac, please create a project on iCloud Drive using QuickPlan on an iOS device.
Do not edit the same project on multiple devices at the same time.