Mesh Version Modifier

Hi, just like in Mac OS, it would be nice to have a modifier which creates a new version (layer) of the mesh that can be edited. This can be very useful when we have different options and we don't won't to create another version of the same file or a duplicate of the mesh. You can browse between different versions of the mesh when you are not sure about the changes that you want to make.

I don't think any other 3D software has this feature. It would be great to see it for the first time in Blender. :)