transfer Old Sumerian scenes to new environment

Question 01) Scenes that are affected

Will I completely lose aceess to all of my old Sumerian scenes? Recent (last) notifications said affected resources of mine are two as below:

• us-east-1 9c2cf845e10a____8da593be7a7c2cbe.scene
• ap-northeast-2 c07380d05f____839fe29108c3c72128.scene hid four letter in each resource ID

Then the scenes I'll not be able to open are only those two above?

Question 02) How to backup old scenes, Can I have more time?

I know you gave the users a year (or more) of time to prepare this change but I haven't had time. And even on this last day I'm fully occupied with other urgent works and cannot do needed job to save my scenes. (I did quick try earlier today but plug-ins are not properly installed on Babylonjs Editor and I cannot spend time to solve this for now. )

Aren't there any ways of back-up and transferring my scenes later? (I'll do it in one or two months.) It was possible to backup scenes before but I cannot find that feature now. I only see a menu for exporting to glTF which is not the backup method I used before.

Thank you in advance. Regards, Mira