# File lib/rq-2.3.1/backer.rb, line 15
      def backup 
#--{{{
        set_q
        bak = @argv.shift
        bak ||= "#{ @qpath }.#{ Util::timestamp.gsub(/[:\s\.-]/,'_') }.bak"
        raise "<#{ bak }> exists" if bak and test(?e, bak)
        debug{ "bak <#{ bak }>" }
        @q.lock{ FileUtils::cp_r @qpath, bak }
        info{ "created backup <#{ bak }>" }
#--}}}
      end