dug 
How did I not know about https://eclecticlight.co?
macOS Catalina is the first version of macOS which boots not from a single volume, but from two: a read-only System volume named by default Macintosh HD, and a writeable Data volume with the default name of Macintosh HD - Data. If you upgrade to macOS 10.15 Catalina, your boot volume will effectively be split into those two.
V interesting stuff and well worth a visit:-)
Part of the fun of rediscovering blogging is not only noticing when a search returns great independently produced content, it’s also pausing long enough to reflect on it and add it to your http://del.icio.us link store (via @internetarchive).
Of course I haven’t used delicious in years so I’m going to be adding the good stuff here and tagging it “del.icio.us”
Stay at home, protect the NHS, save lives. Please. (at least for now, until the boffins agree on some next steps)
Archival? No, not really...