Backup GPG keys on paper
I discovered an app that allows you to export your private GPG keys and print them on paper for backup:
Secret keys should be backed up even better than other data, because they are impossible to recreate should they ever be lost. All files encrypted to lost keys are forever (or at least for a long time) undecipherable. In addition to keeping backups of secret key information on digital media such as USB-sticks or CDs it is reasonable to keep an if-all-else-fails copy on plain old paper, for use should your digital media ever become unreadable for whatever reason.
paperkey --secret-key my-secret-key.gpg --output to-be-printed.txt