gistfile1.txt

      def perform!
        super

        invoke_flush! if invoke_flush
        disable_flushing!(true) if disable_flushing
        begin
          unless backup_all?
            invoke_close! if invoke_close
          end
          copy!
        ensure
          disable_flushing!(false) if disable_flushing
        end

        log!(:finished)
      end