One archive file, and add it to auto-mode-alist.
(advice-add 'org-refile :after (lambda (&rest _) (re/org-save-all)))
\f
;; Archiving (use re/org-archive-all periodically)
-(setq org-archive-location (concat "~/org/"
- (format-time-string "%Y" (current-time))
- ".org::datetree/"))
+(setq org-archive-location (concat "~/org/old.org_archive::datetree/"))
+
+(add-to-list 'auto-mode-alist '("\\.org_archive\\'" . org-mode))
(provide 're-org)
;;; re-org.el ends here