Hi Gaston, yes normally the way to solve that is by saving to a different version every once in a while so you have numerous versions as different 3DM files on disk instead of only one single file.

There is a command that can help you with that called IncrementalSave:
http://moi3d.com/2.0/docs/moi_command_reference10.htm#incrementalsave

One way to use it is to go to Options > Shortcut keys, and add in a new shortcut like maybe Alt+S and for the command name put in IncrementalSave

Then when you wanted to save to a new file push Alt+S and it will save your file to a new name with an incremented number in the name, like myfile1.3dm, myfile2.3dm , etc...


I am also interested in trying to make undos be persistent instead of being only for one modeling session. The tricky part about that is that it will probably make for a pretty large additional file that has all that information stored in it.

- Michael