Is it possible to save separate versions of CSS through GULP?

Question

JavaScript

I think layout designers often encounter this when they give the layout with a calm soul, and after a while the customer asks to add something there. I added the changes and sent it to the customer, and the customer says that like this and that, we made changes in the CSS file, could you tell me what exactly you changed?
Well, that's the essence of the question, is it possible to track these changes somehow? for example, before making changes, set a new version and save to a separate file.
I know that it's easier to make a new file and add changes there, but the bottom line is that you don't want to manually create new files every time and copy sass classes like this:

.list{
  &-items{
    > li{
      //тут сделать правки
    }
  }
}

The second option, as I understand it, you can use git, compare 2 files, but you know, it’s also hemorrhoids, manually copying all the changes that I did there)
I searched on the net, I didn’t find anything like that for GULP, maybe I didn’t look well)) I will be very happy any ideas)