Do not put egg in one basket. Simply do not put all money in one bank. Put 80k in one bank and 50k in another bank. Open 6 banks and more. If one bank closes, you have another bank.
First principles means breaking a problem down to its most basic truths, and then reasoning up from there, instead of relying on assumptions or past experience. Instead of asking “How is this usually done?”
Ask “What must be true at the most basic level?”