 
 ;; (3) Toggle read-only-mode; toggles buffers between editable and read-only states.
 ;; `C-x C-q' or `M-x read-only-mode'
+
+;; (4) Backups using prefix args to `save-buffer' (C-x C-s)
+;;                 C-x C-s -> Makes the prev version into a backup file if
+;;                            previously requested or if this is the first save.
+;;             C-u C-x C-s -> Marks this version to become a backup when the
+;;                            next save is done.
+;;         C-u C-u C-x C-s -> Unconditionally makes the previous version into
+;;                            a backup file.
+;;     C-u C-u C-u C-x C-s -> Does both of what C-u prefix and C-u C-u prefix do.

      (re-search-backward "\\b" nil :noerror))
    (map-query-replace-regexp regexp to-strings)))

;; Make backups
;; http://ergoemacs.org/emacs/elisp_make-backup.html
(defun modi/make-backup ()
  "Make a backup copy of current file.

;; Time-stamp: <2015-08-07 09:36:41 kmodi>

;; Functions related to editing text in the buffer

