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They have two different approaches to persistence, with different tradeoffs: https://redis.io/topics/persistence

Either would have the generic disadvantages of:

- Dataset can't exceed available memory

- The general disadvantages of NoSQL vs SQL around queries, transactions, etc, if you're expecting relational type functionality

There are also managed solutions that implement Redis with partial flash storage. Redis Enterprise and AWS ElastiCache both do this.

> Dataset can't exceed available memory

From my understanding, they do support sharding

Sure, but still limited to the total amount of memory of all machines. You can't page in/out from storage.

You can store Terabytes of data in Redis. Just google it.

Yes, in Terabytes of RAM, or some separate commercial offering with flash. Not sure I get your point.