This can be achieved now using the API (currently in beta). We are looking into exposing it in the UI in a future release.Daniel Chalef commented
We've had an explosion of data sources (enthusiastic managers loving the visibility Klipfolio brings). Given API limitations on our data services, and the risk of incorrect data being used by users (outdated, duplicated datasources), it would be good to view a report of which klips are dependent on a datasource. This would allow us to delete and consolidate.
We are looking into this idea.