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GNU Emacs Manual

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M.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 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.

M.5.1 Auto-Save Files  The file where auto-saved changes are actually made until you save the file.
M.5.2 Controlling Auto-Saving  Controlling when and how often to auto-save.
M.5.3 Recovering Data from Auto-Saves  Recovering text from auto-save files.


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