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Its software reached the end of support, and its records must outlive it. One component rewrote data as it read it, so the migration copies rather than converts — an operation with no rollback has to be survivable, not merely careful.
A Business Continuity Plan stated as two numbers — an RPO of six hours and an RTO of seconds for the data — and the few small scripts behind them: full and incremental backups, one technique per data store, restore as the only test that counts, and config treated as data.
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