[eternityforest]

What's the process for legitimate code updates and the like on that kind of system? Do you take the disk out and write directly to it?

[bootwoot]

It's been a few years for me. But at the time, write anything you want to bring in to DVD-R (write-once). Including system updates, documentation, open-source libs, etc.

[xvector]

I suspect most airgapped systems aren't updated.