1What to back up
The private key export, the revocation certificate and a note of the fingerprint.
2Where to keep it
On encrypted offline storage such as a USB stick kept somewhere safe, separate from your everyday device.
3Test the backup
Once, restore it on another machine or in a fresh user account to make sure it actually works.
4Update after changes
Repeat the backup whenever you extend the expiry date or add a new subkey.
Lesson summary
Back up the private key and revocation certificate offline, and test the backup once.
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