(Sorry for not answering the question as posed)
What I do as a habit on both PT and Nuendo is save-as regularly. I increment the “version” number as I go. I actually mostly don’t have to go back to earlier versions, but if I ever have to I have confidence I can find a version that is very close to where I was at some point. And it extends beyond offline history and also in a sense includes different states of progress in editing and mixing. I know that might seem like complete overkill to people, or just be simply annoying (especially to manage in Nuendo’s folder structure), but for me that works. So it’d be for example;
“Project 0.0” - importing all media and making sure it’s lined up
“Project 0.01” through 0.09 - all editing
“Project 0.1” and up with each .x being a completed Act or Segment mixed of a show, and finally
“Project MIX 1” when the first mix is completed.
And then when I get mix revision notes;
“Project MIX 1.1” and up while working, until I reach “Project MIX 2” for the second version. I suppose this is a bit similar to software numbering… maybe…