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hi Michael - it's referring to the mongodb database. it stores information on each feature, as well as aggreate experiment results - as a result, the amount of data that is stored (and resources required) is relatively small - we store no row level event data. When you self-host growthbook, you have to give it a Mongo or documentDB connection string - this could be from the docker container we add to the docker-compose or hosted elsewhere yourself

Thank you very much. Yes that makes sense