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By default, Emacs will only make a backup of a file the first time it is saved. You can explicitly control further backups as follows:
the version thus saved will be made into a backup file if you save the buffer again.
saves the buffer, but first makes the previous file contents into a new backup file.
does both things: it makes a backup from the previous contents, and arranges to make another from the newly saved contents if you save again.