backup-each-save.el backs up is a more comprehensive system for saving backups on each buffer saving, as opposed to adding code to ForceBackups.

To activate:

    (require 'backup-each-save)
    (add-hook 'after-save-hook 'backup-each-save)
    (defun backup-each-save-filter (filename)
      (let ((ignored-filenames
    	 '("^/tmp" "semantic.cache$" "\\.emacs-places$"
    	   "\\.recentf$" ".newsrc\\(\\.eld\\)?"))
    	(matched-ignored-filename nil))
         (lambda (x)
           (when (string-match x filename)
    	 (setq matched-ignored-filename t)))
        (not matched-ignored-filename)))
    (setq backup-each-save-filter-function 'backup-each-save-filter)

backup-each-save.el works well for me, but I had a problem with the variable “file-remote-p” being undefined. While I can simply remove the line that checks whether it is a remote file, I would like to know if there is a different solution?


That should only be an issue for fairly old versions of Emacs, however the version of backup-each-save.el hosted here at the Wiki (at least; I can’t access the other URL) looks like it accounts for this possibility.

Sadly I have to use windows at my workplace and ‘backup-each-save’ didn’t worked out of the box. When I saved a file, the function tried to create folders with that kind of path : “c:/some/path/c:/some/path” resulting in failure to do so (invalid argument).

I know almost nothing in elips but I managed to fix the issue with the following code, at line 125 of the 1.4 version ( ) :

this :
+ (replace-regexp-in-string "c:/" "" containing-dir))))
Instead of this :
- containing-dir)))

Here is the code in context :

    (defun backup-each-save-compute-location (filename)
       (let* ((containing-dir (file-name-directory filename))
             (basename (file-name-nondirectory filename))
              (format "%s/%s"
    ;;                containing-dir))) ;; Here is the original code
                      (replace-regexp-in-string "c:/" "" containing-dir)))) ;; Here is my modification to make it work on windows
         (when (not (file-exists-p backup-container))
          (make-directory backup-container t))
        (format "%s/%s-%s" backup-container basename
                (format-time-string backup-each-save-time-format))))

It’s probably hacky but it works for me. I hope it will be useful to other (unwilling) windows users. I tried to emailed the author, but the mail couldn’t be delivered.

– Max