If you are referring to the DDR, I have to strongly disagree. That wall was designed to keep people in, not fascists out.

There also are distros with some kind of similar safety net. Immutable distros usually let you Boot previous versions if an update breaks something. This usually means that they need a lot of storage tho. https://itsfoss.com/immutable-linux-distros/

Her Wikipedia article says she became popular in south Korea for telling stories about her life in north Korea on social media. Unfortunately, I cannot read/speak korean. Does anyone know how she described it there?

No

Looks like your PC tells you to disable overdrive. Have you tried that?

They can technically but you will run into all sorts of problems. A Server is usually on all the time while a general purpose computer only periodically. There are two routes I see how you might get this to work:

• If you use more of the general purpose PC: Just run a Type 2 hypervisor like virtualbox on your normal desktop OS and run all your server stuff in there. You can also run Proxmox inside virtualbox. This is called nested virtualization.
• If you prefer to learn more virtualization: Run Proxmox, then run your preferred Desktop OS as a virtual machine inside Proxmox and pass through your GPU, mouse and Keyboard. This is called PCI/USB passthrough

Both approaches take a lot of ram (I recommend at least 16 GB).

Hope this helps :)