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Durability and Availability Are Separate Storage Guarantees

The outcome promises a result someone else can re-derive from the recorded inputs, which is a durability claim about the inputs, not an uptime claim. Learners routinely read 'eleven nines' as protection against accidental overwrite; conflating the two guarantees is what makes a supposedly reproducible dataset silently unreproducible.

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Measuring Availability and Durability in Nines for Cloud Storage

"Nines" is a logarithmic shorthand for expressing two distinct reliability properties of a storage or service system: availability, the proportion of time a system is reachable and serving requests, …