(lemacs.info)Auto Save

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Auto-Saving: Protection Against Disasters

   Emacs saves all the visited files from time to time (based on
counting your keystrokes) without being asked.  This is called
"auto-saving".  It prevents you from losing more than a limited amount
of work if the system crashes.

   When Emacs determines it is time for auto-saving, each buffer is
considered and is auto-saved if auto-saving is turned on for it and it
has changed since the last time it was auto-saved.  If any auto-saving
is done, the message `Auto-saving...' is displayed in the echo area
until auto-saving is finished.  Errors occurring during auto-saving are
caught so that they do not interfere with the execution of commands you
have been typing.

* Files
Auto Save Files
* Control
Auto Save Control
* Recover
Recovering text from auto-save files.

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