backend
The backend of a node that names no wow.stores: auto (the default) takes PostgreSQL or MongoDB by the application's DataSource or MongoClient, and refuses to start without either, so that data is not lost by mistake, unless a profile of wow.dev-profiles is active or the internal port binds the loopback interface alone; memory keeps the data in memory on purpose, for one node whose data does not outlive it. postgres, mongo or the type of a community backend's store provider (me.ahoo.wow.spi.store.StoreProvider) name one.