A solar storm is perhaps the most likely major disruptive event Earth will encounter this century. It's great to have a safe withdrawal rate below 4%, but that's worthless if, for example, you can't access funds because a solar storm has erased all record of your brokerage account. Given the number of posts here about SWR, mortgages, etc. it seems to me reasonable to also discuss the current solar cycle since it has a measurable chance to disrupt FIRE plans.
As individuals we can't protect the stock market, much less the whole planet, from a repeat Carrington Event, but there are some inexpensive things that might make a local difference. I keep a small, battery-powered, multi-band radio in a metal box (Faraday cage). I have recent paper copies of the state of financial accounts. I maintain multiple accounts so that if one gets zapped, maybe the other will still be accessible. Yes, it's impractical to prepare for the risk of the entire electrical system getting fried. However, if only, say, 25% of electronic devices are damaged, I suspect there are other simple preparations that could make life a bit easier.