All 7 Persistence (RDB/AOF) questions
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What is AOF, or append only file, persistence, and how does it differ from RDB snapshots? What are the different appendfsync options available for AOF persistence, and how do they balance durability against performance? What is AOF rewriting, and why is it necessary as an append only file grows over time? What happens if Redis's persistence files, whether RDB or AOF, become corrupted, and how would you attempt to recover? What happens during Redis startup regarding data loading, and how does the choice between RDB and AOF affect startup time for a large dataset?
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How would you design a persistence strategy that combines both RDB and AOF to get the benefits of both approaches?

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You would enable both RDB snapshots for fast, compact full backups useful for quick restores and off site backup storage, and AOF for stronger durability during normal operation, configuring Redis to prefer loading from AOF on restart since it typically has less potential data loss, while still keeping RDB snapshots available as an additional safety net and for easier data portability.
CONFIG SET save '900 1'
CONFIG SET appendonly yes
CONFIG SET appendfsync everysec
Real-world example A company running a critical Redis instance enables both RDB and AOF together, getting fast periodic snapshots for easy backup and disaster recovery purposes while also benefiting from AOF's stronger protection against data loss during normal operation.

Common follow-ups: Which persistence method does Redis prefer to load from if both are present after a restart?;What are the tradeoffs of running both persistence methods simultaneously in terms of disk usage and performance?

Redis Backup & Disaster Recovery;Redis Architecture & Installation
All 7 Persistence (RDB/AOF) questions