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RSR

Last Week on My Mac: Brilliant engineering in a flawed interface

After an unfortunate incident three years ago, RSRs were put on pause. Now they’ve been rebadged as BSIs, what is wrong with their current implementation? The list is long.

March 22, 2026 Macs, Technology

What is a Background Security Improvement, and how does it work?

T T Read More

What is a BSI? Is it the same as an RSR? How does it patch vulnerabilities, and how is it installed and activated? What problems does it have, and what are its limitations?

March 19, 2026 Macs, Technology

Apple has just released the first Background Security Improvement for macOS Tahoe

Apple has just released its first public Background Security Improvement (BSI) for macOS 26.3.1 Tahoe, labelled as BSI […]

March 17, 2026 Macs, Technology, Updates

Last Week on My Mac: Tahoe 26.1 disappointments

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Two big disappointments: the new Liquid Glass control does nothing to address the problems, and Background Security Improvements haven’t learned from mistakes with RSRs.

November 9, 2025 Macs, Technology

How Tahoe 26.1 has enabled automatic security updates

If you have updated your Mac to Tahoe 26.1, you may be blissfully unaware that it will now […]

November 6, 2025 Macs, Technology

Last Week on My Mac: Ghosts in the machine

A mystery volume mounts from nowhere, and its name starts with Creedence. This is a cryptex, also favoured in Apple’s Private Cloud Compute. Is it a ghost of the past, or harbinger of the future?

July 13, 2025 Macs, Technology

A brief history of installing Mac OS: Mac OS X and beyond

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From Installer packages and metapackages, to the first for Big Sur with its new boot volume group. RSRs and their demise, and when an upgrade is an update.

March 22, 2025 Macs, Technology

Last Year on My Mac: miniest mini and more

From the start of the fourth cycle in M4 Macs and the smallest ever, through the omission in macOS VMs, and QuickLook shortcomings, to the stealth firmware update.

December 29, 2024 Macs, Technology

Where has Safari gone, and why are macOS updates larger for Apple silicon?

Safari and its supporting frameworks and components, used to be installed in the Data volume, but now come in cryptexes. These also account for the larger macOS updates for Apple silicon.

September 4, 2024 Macs, Technology

macOS updates are shrinking, but what happened to RSRs?

How large were Sonoma’s updates? How many were unscheduled patches? Why were there no RSRs? What does Sequoia hold in store?

August 14, 2024 Macs, Technology

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