Question: After calculations best way to export

After loong time calculations i obtained results and manually fitted them. Of course, as usually happens, kernel broke and all i have is output (output in rtable form). So i decided simply export-import them and continue my manipulations.

All i see is "export to ml form". So i did it. And after that i tried to reimport them via

MathML[Import]

But i still have no results because Import needs string

and my temp file have expression:

s:="looong mathml expr";

and command from worsheet read "temp.txt";

hangs whole maplew process so i don't have access to other worksheets. Of course somehow i will wait this operation end but for next time how to export already calculated output in rtable form to be able reimport it after?