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The article explains how Baidu Cloud Redis's Data Flashback feature combines RDB snapshots with timestamped AOF logs to provide fast, space‑efficient, point‑in‑time data recovery, overcoming the limitations of native Redis persistence in high‑traffic scenarios.
Redis offers three persistence options—AOF, which logs every write command; RDB, which creates periodic snapshots; and hybrid persistence, which combines both—to balance data safety, recovery speed, file size, and performance, with configurable settings for sync policies, rewrite processes, and compression.
This article explains Redis's persistence strategies—including RDB snapshotting with Copy‑On‑Write, AOF command logging with configurable fsync policies, and the hybrid persistence introduced in Redis 4.0—detailing their implementation, performance trade‑offs, configuration options, and practical usage examples.