Can Redis be fully relied upon as a durable data storage solution?

Redis is a high-performance in-memory data store with disk persistence capabilities. However, it is not recommended to rely solely on Redis as the only durable storage solution for several reasons:

• Redis stores data in RAM, which limits the amount of data that can be stored and increases the risk of data loss in case of failures if persistence is not configured.
• Persistence in Redis is implemented through snapshots (RDB) and command logs (AOF), but they do not guarantee 100% data safety in case of crashes.
• Redis is not a transactional RDBMS with full ACID support, which is important for critical data.

Therefore, Redis is often used as a cache, message broker, or for temporary data storage. For long-term and reliable storage, it is better to use traditional databases (e.g., PostgreSQL, MySQL) with replication and backups, with Redis serving as an acceleration layer.

Example of AOF configuration for increased reliability:

appendonly yes
appendfsync everysec

This configuration allows Redis to write operations to disk every second, reducing the risk of data loss.