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(emacs)Auto Save

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Auto-Saving: Protection Against Disasters
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   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.  The message
`Auto-saving...' is displayed in the echo area during auto-saving, if
any files are actually auto-saved.  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. The file where auto-saved changes are

actually made until you save the file.

Control

Auto Save Control. Controlling when and how often to auto-save.

Recover

Recovering text from auto-save files.