Introduced in Mac OS X 10.7, it remained an HFS+ partition until High Sierra. With Mojave, it became an APFS volume, except for M1 Macs.
APFS
The split startup volumes in Catalina, Big Sur and Monterey can be disorientating. Here’s how to find your way in the Finder and Terminal.
Turning the data blocks into files and directories, these have common functions and additional features which can give rise to tricky problems.
A great advance in APFS which enables Big Sur’s Sealed System Volume, and backups being made to APFS. Here they’re fully explained.
A lot of what Time Machine does when making backups to an APFS volume remains a mystery. So far we don’t understand the magic used by Apple.
macOS 11.5 will be available in a few days. Should you risk upgrading? Here are some of the major issues which you need to consider when deciding and planning any upgrade.
Most hard disks become increasingly likely to fail after 3 years. All Time Capsules are now in that zone, and should either be replaced or have their hard disks replaced.
Close to the top of my shortlist of new features in the next Apple Silicon Macs is that kernel panics become a thing of the past.
Content Caching server originated in 2005, as a feature in Mac OS X Server, which sold Xserves. Time Machine came in 2007, to support Time Capsules. Those legacies are so different, though.
macOS 12 Monterey promises consolidation and improvement, even truth and reconciliation perhaps. But Shortcuts and Universal Control promise strongly.
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