Quickest way to migrate a pgsql database from one RDS cluster to another

Hey there. Yes that’s one option I have used in the past. But like you say a big dataset can take time.

Database migration as such will take as long as how much data there is.

However, AWS do offer a service that can do this for you. DMS which I also use. You can migrate and keep in sync data from one DB to another.

Please see https://docs.aws.amazon.com/dms/index.html