Easy, tattoo your public and private keys on your body somewhere, maybe as QR codes. Joking aside, I do use some things like hashes of works of literature and

Easy, tattoo your public and private keys on your body somewhere, maybe as QR codes. Joking aside, I do use some things like hashes of works of literature and other important things to me as keys and archive hashes as their own passwords. I also send emails to myself explaining my thinking when I make certain decisions. It's like commenting my life. And if I lost my memories, would I really selectively miss the data that belonged to former me? That's a scenario to think about.