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I believe they are not required when creating a DB from a snapshot.

Maybe not, but that should be a different entry point.
It’s concerning that so many fields are repeated between cluster and instances.

I shouldn’t have to supply
```engine: "aurora-postgresql",
 engineVersion: "11.4",```
For every replica put up.
Also I am wondering how snapshots work with

`copyTagsToSnapshot: true`  defined on instances, since it’s also defined on the cluster.
Does it add additional tags from the instance to the tags defined on the cluster?