Performed by CacheDelete, it first looks at a wide range of macOS caches, and only at the end purges snapshots, to free up space when it runs short.
Time Machine
Good space management doesn’t bring new emoji, but it makes a big difference when the Finder doesn’t give completely inaccurate figures for Available space. A practical demonstration of its gross errors.
T2 and Apple silicon Macs always encrypt the Data volume in internal storage. So why bother with enabling FileVault? And can you do that on external bootable disks?
Detailed account from the decision to start making an automatic backup to its final reporting and completion, for Ventura 13.2.1 to local storage.
You’re running bit short of disk space, so put tens of GB of old files into the Trash, then empty it. Why doesn’t the amount of free space increase?
While macOS uses DAS-CTS to schedule hundreds of background activities, third-parties normally use launchd. Comes with a full diagram explaining DAS-CTS.
Backing up with Time Machine to a NAS or other network storage is different. Here’s an account of how it creates and handles sparse bundle storage in Ventura 13.2.
How running a background task takes a tiny fraction of second, although the task itself takes seconds or minutes, and why it’s run on E cores.
How macOS schedules tasks like making automatic Time Machine backups, from property list to transactions between DAS and CTS.
The story of how Mac OS X went from cron, to launchd, and ended up with Duet Activity Scheduler, to schedule background activities like backups.
The Eclectic Light Company 