(emacs)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 that 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 been 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 FilesThe file where auto-saved changes are actually made until you save the file.
* Control
Auto Save ControlControlling when and how often to auto-save.
* Recover
Recovering text from auto-save files.

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