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Uh. You just paste back and save again, no?

Select all, paste whatever happens to be in the clipboard, save to disk.

That's a disastrous series of commands.

C-x is cut. C-v is paste. C-a C-x C-s cuts everything to clipboard and saves an empty file. C-v C-s would restore this.

So C-a C-x C-s C-v C-s is just a funny way of saying C-s.