{not available when compiled without the |+wildignore| feature} A list of file patterns. When one of the patterns matches with the name of the file which is written, no backup file is created. Both the specified file name and the full path name of the file are used. The pattern is used like with |:autocmd|, see |autocmd-patterns|. Watch out for special characters, see |option-backslash|. When $TMPDIR, $TMP or $TEMP is not defined, it is not used for the default value. "/tmp/*" is only used for Unix.