There are three repositories.
- FlowFile (tracks metadata about things actively in the flow)
- Content (holds the actual underlying content for things in the flow or still in archive)
- Provenance (holds metadata about the events that went through the flow)
Provenance and content lifecycles/storage amounts/etc.. can differ. When a piece of content is still available you can click to it from provenance.
You can adjust your content repository settings. By default it will start reclaiming space after 50% utilization of the partition it is on.