ive lost many due to my own stupidity over the many years.. testing new wallets without understanding them enough, not having copies of seeds, having a couple paper wallets deteriorate, not maintaining proper backups.
paper notebook and paincil
the typical paper notebook is pretty low quality paper. ink blurs and washes out. use high quality archive paper and pencil (doesnt wash out typically) or permanent marker (test it 1st companies seem to differ on whats "permanent").
better: stamped high melting point metal of some sort.
i retract my quote becouse it not on wright place and in some cases its god to have notebook with some paswords and keys becouse they are accessible only people that are phyisicaly around and not worldwide as on computer if you keep them there.But theres alvays a better way ofcourse.