[techcode]

I haven't gotten around to experimenting with https://wiki.calculate-linux.org/templates and https://old.calculate-linux.org/main/en/calculate-assemble

TL;DR: you can pre-configure and keep updating/building new versions of your own live-boot image of Gentoo/Calculate. Which kind of get's you "previous known-good builds" just the other way around.

Oh and the other thing I also never needed to use is update/rescue of Gentoo/Calculate installation through it's flip-flopping between two root partitions.

Calculate installer by default creates two root partitions, but I've only ever used one. And so far `cl-update` never broke the system - even when I was so far behind that my version of python and glibc got masked (or maybe even removed).

Back on vanilla Gentoo - being that far behind usually meant it was easier to reinstall Gentoo from stage3 :D