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?