I legitimately back up my history file. Mostly because it likes to truncate itself randomly (though this may have been fixed in zsh, or my config, because it’s been a while). Just a systemd timer that triggers a shell script to copy it by date and rotate anything older than 100 copies.
Edit: WHY DID I SAY ANYTHING? After like 3 months of no problems, my history truncated itself to 3 entries a few minutes ago. I’ve only ever seen a few days of loss before that lol.