A lot of stuff collected over the years. In most cases, every time I enhanced, I also kept the stuff that was being enhanced, i.e. the old stuff. Not everything, but a lot.

Some of my enhancements were borderline bleeding edge so I always wanted to be able to go back. Turned out I never did. Sometimes an enhance had to be re-enhanced as something newer/better became available but I don’t recall ever having to go backwards.