Move doc of backup-directory-alist to the Backup node

* doc/emacs/files.texi (Backup): Move the documentation of
`backup-directory-alist' here from the "Single or Numbered
Backups" node, because it doesn't seem to have much to do with
numbering (bug#18692).

(cherry picked from commit e77b8d84b4161f2cf8720dec2bf44a3e50134398)

1 files changed, 12 insertions, 13 deletions

diff --git a/doc/emacs/files.texi b/doc/emacs/files.texi
index ab20d4a18f9..af7a2fc2f3d 100644
--- a/doc/emacs/files.texi
+++ b/doc/emacs/files.texi
@@ -522,6 +522,18 @@ a new backup file.  @kbd{C-u C-u C-u C-x C-s} does both things: it
 makes a backup from the previous contents, and arranges to make
 another from the newly saved contents if you save again.
 
+@vindex backup-directory-alist
+  You can customize the variable @code{backup-directory-alist} to
+specify that files matching certain patterns should be backed up in
+specific directories.  A typical use is to add an element @code{("."
+. @var{dir})} to make all backups in the directory with absolute name
+@var{dir}.  Emacs modifies the backup file names to avoid clashes
+between files with the same names originating in different
+directories.  Alternatively, adding, @code{("." . ".~")} would make
+backups in the invisible subdirectory @file{.~} of the original file's
+directory.  Emacs creates the directory, if necessary, to make the
+backup.
+
 @menu
 * Names: Backup Names.          How backup files are named.
 * Deletion: Backup Deletion.    Emacs deletes excess numbered backups.
@@ -585,19 +597,6 @@ value is @samp{nil} or @samp{existing}, then @code{version-control}
 becomes @code{nil}; if it is @samp{never} or @samp{simple}, then
 @code{version-control} becomes @code{never}.
 
-@vindex backup-directory-alist
-  You can customize the variable @code{backup-directory-alist} to
-specify that files matching certain patterns should be backed up in
-specific directories.  This variable applies to both single and
-numbered backups.  A typical use is to add an element @code{("."
-. @var{dir})} to make all backups in the directory with absolute name
-@var{dir}; Emacs modifies the backup file names to avoid clashes
-between files with the same names originating in different
-directories.  Alternatively, adding, @code{("." . ".~")} would make
-backups in the invisible subdirectory @file{.~} of the original file's
-directory.  Emacs creates the directory, if necessary, to make the
-backup.
-
 @vindex make-backup-file-name-function
   If you set the variable @code{make-backup-file-name-function} to
 a suitable Lisp function, you can override the usual way Emacs