

So essentially almost the entire hard drive is taken up by the new Catalina partition and the old High Sierra partition as alot of stuff is doubled up between the two, even the core macOS files are on both partitions almost like you could dual boot the machine if you wanted. We took Mojave off and are now going to Catalina and for some reason when I upgraded my last good image from High Sierra up to Catalina it kept the entire High Sierra build as a separate partition on the hard drive. I have never had an issue with this before and started doing this in El Capitan.

Then all I have to do is some user specific settings after that. Then as I need to build a new machine I just install macOS and then import all of the settings from my time machine backup into the new build. So the way I build our Macs to not have to build from scratch every time is to build 1 Mac the way I want it, all the security settings set and apps installed then I make a full time machine back up of that machine. Our server/infrastructure teams do not really support a back end on imaging/supporting the few Macs we have at all. So I manage a relatively small footprint of Macs at our company, about 20.
