I only keep and archive raw files that end up as processed and completed images. No way I am willing to drown in data files never to be used.
In fact, my work flow allows all captured files only to exist for a short period on a designated "bottle neck" disk storage. When files from a session are selected and processed, they are copied to a final destination on the network but left on the bottleneck. When the bottleneck storage threatens to overflow (a matter of time depending on the shooting activity), everything is deleted there and the process starts again.
On a trip, the bottleneck actually is the additional hard drive linked up to my laptop of choice for the occasion. Thus, the culling and weeding process already have commenced when I return and hence only a subset of the captured data would be transferred to the system bottleneck storage at home.