Do you use saved versions in documents? If a file is evicted by you or macOS, then all saved versions will now be removed, and lost forever. How to work around this serious bug.
Optimize Storage
At one time, trying to manage iCloud Drive storage was like getting into a lift with only an Up button. What happens then when Apple fixes that bug? Anguish and anger.
If you have files in iCloud Drive that have been evicted from your local storage, and have Optimise Mac Storage turned off, Sonoma may bring a big surprise.
iCloud Drive just works. Time Machine just works. So Time Machine should back up the contents of your iCloud Drive? Maybe not.
When you keep documents in iCloud, are they backed up in Time Machine, searched in Spotlight, and kept securely?
Should Time Machine back up on demand, or every hour? Sierra doesn’t seem sure. And how Apple needs to think of users more in the App Store.
The Eclectic Light Company 