On import I always use the 2nd copy feature. With the high burst rates of new cameras, the 2nd copies folder gets real big real quick. Every so often I clean it out of old 2nd copies. I also create 1:1 previews. I love the feature that deletes 1:1 previews older than 30 days or whatever. It makes life easier. Couldn't we have a similar feature for 2nd copies to automatically clean them out after a set time?