Does "Edit with Emacs" saves a local file of current edit buffer?

Question

I'm using Edit with Emacs to edit Stack Overflow and Stack Exchange sites.
Currently I'm doing it with this message ;-)

When I click on the button under the text area of Chrome browser, I get a new file opened on Emacs. Current file is named emacs.stackexchange.com/questions/ask. When I press save the file: C-x C-s, the text gets updated in the browser.

Is the file saved somewhere in the filesystem, so I can recover it locally, just in case I kill the current buffer?

Answer 1

Looking at the code it does not seem that edit server save the contents to a file. However it does provide a hook edit-server-done-hook which running every time you do edit-server-save (C-xC-s) or edit-server-done (C-cC-c) you might add a function to the hook to save the current contents to a file.

A not-so-well-tested example is given below

(defvar my-edit-with-emacs-backups-dir (locate-user-emacs-file "edit-with-emacs-saves"))

(unless (file-exists-p my-edit-with-emacs-backups-dir)
  (make-directory my-edit-with-emacs-backups-dir))

(defun my-backup-edit-with-emacs-contents ()
  (let ((backup-directory-alist (list (cons "." my-edit-with-emacs-backups-dir))))
    (save-excursion
      (write-region nil nil (car (find-backup-file-name (buffer-name))) nil 0))))

(add-hook 'edit-server-done-hook #'my-backup-edit-with-emacs-contents)

With the above the you edit-with-buffer contents will be backed up in ~/.emacs.d/edit-with-emacs-saves directory whenever you do edit-server-save (C-xC-s) or edit-server-done (C-cC-c)