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No amount of hitting save would have saved the author here

My mistake, I meant to say use "Save As" in my post. With save as used, I add a number to the existing file name, thus undo copy only erases the original file copied from one folder to the other folder. (The original file is still persevered in the first folder.) Sorry.

Good, that's what I do. At least it's what I do by far most of the time. Trouble is, the inevitable happens on rare occasions when I don't follow those rules. Moreover, such disasters usually happen when I'm a hurry.

That's why, by now, Microsoft should have recognized that such incidents happen and responded by building in protections into Windows to avoid them.

And how is that relevant to the specific scenario presented in the article?

That would not have helped you in the case described in the article.