Scott, I'm shooting residential real estate and blending. I'm almost exclusively working with a higher end market which gives me a little more flexibility in terms of time. My workflow works for what I'm doing.
Although, I think your one comment answers it. I also never go back and re-edit after delivery, especially 3 months later. I don't think I really need all those raw files. My plan to keep a raw and a tiff will be enough to get everything on one, possibly two, drives. I also have 1080p jpeg files on the server for the virtual tours which I can always recover. I think I'm going with that.
Thanks everyone.
I don't understand why you're taking so many photos. The top real estate photographer here just takes a single shot and uses 12 lights all around the room to fill in the dark areas. You have a little screen on your camera that you can zoom in on to double check the trouble spots before moving on because you'll know where they are. That's probably the smartest way to save on archival space... 5 raw files + a tiff is crazy.

