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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I store them in my password manager. I also backup my Aegis database to my laptop, so I always have at least 2 different devices from which I can obtain codes.
Locally hosted https://www.passwordstore.org/, with a remote git repository on an internal server unavailable from the Internet which has proper (encrypted) backups as well. pass also has a otp add-on, to retrieve TOTP tokens in a secure way.
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