How I backup/restore my chromebrew setup and manually-installed items in /usr/local/bin by using group
In dev mode chromeos, most mounts are noexec except /usr/local so that is why executeables are in /usr/local/bin Almost everything in my /usr/local was installed by chromebrew (crew) except a few items I manually copied to /usr/local/bin
As a way to tag items I manually added, I change the group from chronos to some other group and I chose midis which seems safe. So for example, I like to keep a non-executeable list of what crew has installed in /usr/local/bin
crew list installed > /usr/local/bin/crew-list-installed.txt
I also sometimes manually install in /usr/local/bin some *.sh or a few binaries crew does not (yet) provide, like btm.