-@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.
-