I'm using org-mode for a several months and recently a sad thing
happened with me. I suddenly found that a subtree where I look into
rather rarely, but the information there is quite important,
disappeared. Obviously I have stroked C-k while the point was located on
the collapsed tree, and whole my tree disappeared and I did not even
noticed that. When I found there is no subtree, it was already too late
to restore it: there was no such change in undo history and probably I
have removed that subtree in one of my previous emacs sessions.
Dmitry,
I know this isn't much help in your present predicament, but I would
suggest that you have a look at "Using Version Control with Your Org
Files" at http://orgmode.org/worg/org-tutorials/index.php#sec-3.3
(declaration of interest, I wrote it).
Using a VCS in conjunction with cron considerably mitigates the impact
of such disasters. Provided you commit your changes frequently (e.g.
with cron), you can normally recover almost anything you deleted in error.
Ian.
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