Create a test environment

I want to do some major changes to my code, but am afraid to do it in my stable environment

How can I “duplicate” my code perhaps in an another project, so I camn do mods without stress of breaking my good code

You can create a new version with the version control, or export the project and import it under a different name.

Would I need to create a new project and import into that

You can try… If you are afraid of destroying things, then make a full binary backup so you can revert.

I did an export and a download
When I look at my folder/files, to import, it is very small and greyed out. Anyy idea?

Very odd, doesn’t look good. But no clue what goes wrong here.