Some are reporting that recent MRT updates have been installed 15 times. If your Mac affected? Does it keep installing the same security data updates?
softwareupdate
If you don’t want to leave Software Update to install updates automatically, here are the options for using softwareupdate, SilentKnight and silnite instead.
You might want an old macOS or OS X installer to build a Virtual Machine, or for an old Mac. Here’s how to get them, and old versions of Xcode.
For those who want macOS updates promptly, SilentKnight can be a help. But don’t use it to download and install an update.
What to do when SilentKnight offers you large macOS updates, or updates which you don’t want to install just yet, and other problems.
Full macOS installers come in different presentations according to how they’re obtained. Explained here are what’s in an installer app, and how a bootable installer disk works.
In macOS 11.5.1, Apple has squeezed a thimbleful of a patch into a ten-gallon can of update, more than 99% of which is overhead.
Details of how the Content Caching server handles a cache macOS security data update, and both client and server handle an App Store update.
Using Activity Monitor and command tools to assess performance of a content caching server, and diagnosing problems from the log.
Although updating each M1 Mac requires 1 GB of direct download from Apple, there are great economies in running your own Content Caching Server. And why Apple doesn’t want to offer standalone Big Sur updates.
The Eclectic Light Company 