Step by step through moving to iCloud Drive, eviction to a dataless file, materialisation of local data, editing and syncing with iCloud Drive.
synchronisation
You’ve got a good Internet connection and iCloud should be working fine, but won’t sync data between your Mac and devices. Could it be throttled?
How iCloud Drive, concerned with sharing files, and CloudKit, supporting databases shared in iCloud, have changed in Sonoma.
The small stub files used as placeholders for files evicted to iCloud Drive have vanished. Could that be why some Macs had to download the whole contents of their iCloud Drive?
When should you turn iCloud off to try to solve syncing problems? What use is a Content Caching server? What tools can help diagnose and fix problems?
When Sierra’s automatic backups stop or become irregular, other functions fail too. Here are some important and more obvious ones. Is this fixed in High Sierra, and does it affect iPhones too?
High Sierra has done away with the ntpd daemon for keeping your Mac’s clock in sync with a standard time server. This now works as in iOS, using the timed daemon.
Time Machine backups are but one of 70-80 background services which are run by macOS dispatching systems. Here’s a list of some of the others.
Why did Apple keep the headphone socket on its new MacBook Pro, but remove it from new iPhones?
An overview of some of the many ways of keeping folders in sync, backing up, and making remote copies.
The Eclectic Light Company 