Multiple copies in multiple locations. A sealed copy in an envelope kept by your lawyer or insurance agent. This came up a couple of months ago. https://news.ycombinator.com/item?id=31652650 -- https://shkspr.mobi/blog/2022/06/ive-locked-myself-out-of-my... -- https://www.amazon.com/Read-This-When-Im-Dead/dp/0988342553