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Isn’t it another ticking time bomb to accept writes that will be lost if the server is shut down?

Expecting that any key in redis will be there next time you read it is a ticking timebomb. Redis is not a database. It's a cache.

Unless you're using AOF mode with fsync always, you can lose writes. If you're doing that, you should be using a real database instead.

The first line of redis.io:

> The open source, in-memory data store

I don't mean to knock redis. I love redis. I implore you to benchmark Redis in FSYNC_ALWAYS vs Postgres. I encourage you to benchmark it as well with FSYNC_EVERYSEC and understand the tradeoffs that makes - Postgres is still very competitive with EVERYSEC in most workloads, and with a lot less tradeoffs in data reliability.

Yeah, in-memory. That should tell you it's not a persistent data store.

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