(emacs)Backup Deletion

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Automatic Deletion of Backups

   To prevent unlimited consumption of disk space, Emacs can delete
numbered backup versions automatically.  Generally Emacs keeps the
first few backups and the latest few backups, deleting any in between.
This happens every time a new backup is made.

   The two variables `kept-old-versions' and `kept-new-versions'
control this deletion.  Their values are, respectively the number of
oldest (lowest-numbered) backups to keep and the number of newest
(highest-numbered) ones to keep, each time a new backup is made.
Recall that these values are used just after a new backup version is
made; that newly made backup is included in the count in
`kept-new-versions'.  By default, both variables are 2.

   If `trim-versions-without-asking' is non-`nil', the excess middle
versions are deleted without a murmur.  If it is `nil', the default,
then you are asked whether the excess middle versions should really be

   Dired's `.' (Period) command can also be used to delete old versions.
Note: Dired Deletion.

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