Users should be given a third option to defer updating further, as well as doing it now or later tonight. Does the DAS scheduling and dispatch system rely on security through obscurity too?
CTS
How DAS gathers its budgets and loads lists of activities. When rescoring permits, it then dispatches the process to initiate backup. Re-scheduling has changed in Sequoia, as shown here.
Easy to code, these don’t need to use XPC although it’s used by the DAS-CTS scheduling and dispatch system. They aren’t run at constant time intervals, but when appropriate according to other loads.
How does XProtect Remediator scan your Mac once a day? What has gone wrong when it doesn’t appear to work? Explained from its property lists to its three different types of scan.
There’s normally more than 500 background activities, like Time Machine backups and XProtect Remediator scans, waiting for dispatch in the list maintained by DAS. How this works.
Since 2005, macOS has had the master launcher launchd and its LaunchAgents and LaunchDaemons. Then in 2014 Apple added Duet Activity Scheduler to run tasks when conditions are suitable.
Automatic Time Machine backups aren’t scheduled to run at precise times, but when it’s convenient. This explains how, and what to do if goes wrong.
Why XProtect Remediator scans can report BadPluginServiceSignature status_code 31 and abort, and why you don’t need to do anything about it.
What can you do when your Time Machine backups stop running regularly? Or another background activity has gone missing?
While macOS uses DAS-CTS to schedule hundreds of background activities, third-parties normally use launchd. Comes with a full diagram explaining DAS-CTS.
The Eclectic Light Company 