efaq: Disabling auto-save-mode
5.40 How do I disable ‘auto-save-mode’?
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You probably don’t want to do this, since auto-saving is useful,
especially when Emacs or your computer crashes while you are editing a
document.
Instead, you might want to change the variable ‘auto-save-interval’,
which specifies how many keystrokes Emacs waits before auto-saving.
Increasing this value forces Emacs to wait longer between auto-saves,
which might annoy you less.
You might also want to look into Sebastian Kremer’s ‘auto-save’
package (Packages that do not come with Emacs). This package
also allows you to place all auto-save files in one directory, such as
‘/tmp’.
To disable or change how ‘auto-save-mode’ works, (emacs)Auto
Save.