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backup

Should you remove duplicate files?

Save space on your storage and backups by removing all copies. But does it work if they’re APFS clone files? And does that housekeeping utility detect clones for you?

April 22, 2023 Macs, Technology

Why you should enable FileVault

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?

March 31, 2023 Macs, Technology

How does Time Machine make a backup?

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.

March 1, 2023 Macs, Technology

How to get the Trash working properly

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?

February 24, 2023 Macs, Technology

Scheduled activities: 3 launchd or DAS?

While macOS uses DAS-CTS to schedule hundreds of background activities, third-parties normally use launchd. Comes with a full diagram explaining DAS-CTS.

February 2, 2023 Macs, Technology

Backing up to network storage: checks and balances

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.

February 1, 2023 Macs, Technology

Scheduled activities: 2 Running the activity

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.

January 30, 2023 Macs, Technology

Scheduled activities: 1 Scheduling by DAS

How macOS schedules tasks like making automatic Time Machine backups, from property list to transactions between DAS and CTS.

January 23, 2023 Macs, Technology

How macOS schedules background activities

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.

January 21, 2023 Macs, Technology

Lightweight VMs are sparse files, and how to keep them compact

Virtual Machines for lightweight virtualisation on Apple silicon Macs rely on sparse files. Here are tips to ensure they stay small and don’t explode to full size.

January 5, 2023 Macs, Technology

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