dmg of it and save it on one our server sharepoints for backup.
Once I have built one and tested it out, I make a. I'm currently in the middle of building a 10.14 one with compatible versions of the must-have Apps that I install in the tech user on the OS: I install a full known-good (KGB) OS based on the whatever version of the OS we are currently supporting - 10.12 right now. For USB-C machines, I just use an adapter. For awhile, I've been using the 256GB SSD-based Lacie Rugged ones (they are orange).
Every year or so, I build a few 'Tools' external HDs.
