Your comment spurred me to use a 256GB USB flash drive instead of the WD
spinning drive. 256 GB is large enough to do a couple system installs and
multi boot them as well as a bit of data backup. If I need more data
backup than 256 GB provides, I can mount a spinning drive or even a network
drive and back up to that.
I should have done this a long time ago. There have been many instances
where I've used Live drives when I should have built a maintenance drive.