So these days there's very little physical money. Most of my "wealth" is just entries in various digital ledgers. My bank says I have $XXX and my brokerage says I have $YYY and my retirement account says I have $ZZZ.
Let's go with the bank account case. Is it possible that a catastrophic accident or attack could wipe my balance down to $0 with no way to recover? What if a data center was nuked? What if two data centers were nuked?
How much redundancy is in the system? Are there third-party agencies that track private bank ledgers? How hard is it to take them out too?
Ever since I read "The End of Alchemy" (a great book, btw) this thought has haunted me.