(xemacs.info)Auto Save

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14.5 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.

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

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