At the moment we only have a global undo. However undo levels can be quickly used up and they dont get saved in the blend file.

It would be helpful if we had a "history" function in blender just like in the Gimp. Every change a user makes gets saved and you can go back and forth through your changes.

Ideally the history should get saved along with the blend file.

I was thinking there are multiple ways one could handle this.

1. Just store the history in the same blend file as the scene.
This would inflate the file size, but there should be an option in blender where you can select that the file should not be saved with history, or that you can "flush" the history so that only the current scene is stored.

2. Have the history stored in a similar named file just with a different ending. e.g. scene01.blend and scene01.hist

When you load a scene file, blender would automatically check if there was an accompanying history file and load that as well.

If you should wish to submit your blend file to a renderfarm or host it on a server for the public. You could just provide the blend file without the history file in order to keep the filesize down.