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There's a fairly excellent guide on creating a robust key system here: https://github.com/drduh/YubiKey-Guide. Primary and backup Yubikey for use, offline cert keys, and paper backups.
If you're wanting to protect things further you can also also split your backups via a secret sharing scheme (like http://point-at-infinity.org/ssss/) and distribute the fragments to people or places your at least partially trust.
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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Also check out https://github.com/FiloSottile/yubikey-agent which simplifies the setup quite a bit.
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