Ask HN: Do modern nations have contingency/recovery plans?

I'm always at awe at the complexity of our civic structure. But it all seems very fragile. For example, very few people know how their sewers work and how to keep proper maintenance. Who's guarding this knowledge? Who's making sure that we don't somehow forget how to do it? Or that we don't stop replacing aging professionals? This is one of countless examples. Society always seems one bottleneck away from collapse. The same holds true for key human rights and privileges. We're always one generation away from blowing it up. Such lack of clarity and foresight might explain why it's so difficult to replicate civic models in 3rd world countries. Do modern nations have contingency plans? Is there a special archive of practical knowledge and step-by-step procedures for building and running the power grid, water pipes, sewage system, general logistics, basic farming practices and seed samples? We have a pretty sweet thing going on, it would be silly not to back it up. Worst case scenario, we would leave the survivors with guidelines and instructions that could accelerate the recovery of modern society – decades instead of centuries. On a side note, it's all too common to disregard blue collar workers. We should be more respectful of those positions, otherwise young people might actively avoid the very jobs that make up the modern world. Unfortunately, media portrays them as the butt of the joke – everyone is familiar with the simple-minded, blue collar redneck trope. I apologize for the grammar, English is not my first language.