elisp: Backups and Auto-Saving

 
 25 Backups and Auto-Saving
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 Backup files and auto-save files are two methods by which Emacs tries to
 protect the user from the consequences of crashes or of the user’s own
 errors.  Auto-saving preserves the text from earlier in the current
 editing session; backup files preserve file contents prior to the
 current session.
 

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