Is it safe to delete Cloud storage?
Protected Not by removing it in Finder or a cleaner.
Files synced by Dropbox, Google Drive, OneDrive and similar. Deleting them here deletes them in the cloud too. To free space, use the provider's option to keep files online only.
Where it is
~/Library/CloudStorage
What “Protected” means
Another app or a sync service manages it. Removing it breaks that app or deletes it on every device. ClearMac won't move it to the Trash, and tells you where to manage it instead.
How ClearMac handles it
ClearMac shows how much space it uses and explains it, but won't move it to the Trash.
This page is generated from the same rule ClearMac uses on your Mac (cloud.storage), so the app and this page always say the same thing.