Hi Marco, well I guess it depends on what you plan on doing with the second model. Doing that should reduce file size but you would then not be able to use some techniques like recovering original surfaces by an "untrim" if you needed to do repairs later on. It sounds like you have that covered by having another version saved without that but by having 2 versions aren't you ending up with more disk space overall used up than if you just had one version saved?

It's kind of hard to answer your question very well because what's correct or not depends on your particular goals and uses of the model.

- Michael