Just on the offchance someone here has done this …
I want to take a snapshot of my new laptop with all my default apps & environment installed and put it on a USB stick, so I can both use it as a bootable live OS and a ready to go install stick.
There are a few about, but as it’s all essentially voodoo I have to trust they do nothing nasty. Plus most of them haven’t been updated in a while, and I don’t know what the implications of that are, either.
I’m running Ubuntu 20.4, and the two most up to date ones I’ve found are :
https://www.linux-live.org/
and
I know this isn’t really the place, but I’ve received some great help on some offtopic subjects before, so it’s worth a punt