EDIT: The script has been updated a few times. It now has new features. You should check it out again, even if you already have.
exactly what is says on the can. put in the multireddit URL of all your subs (explained in script), get a list of lemmy communities of the same name.
you can also export everything (posts,comments,etc) on reddit via the GPDR data export (assuming its available where you are, idk if its only in the EU)
i will be adding the save-file now
oh yeah, you could also just paste the multireddit URL into a text file as a backup for now. that would do it. there is nothing fancy or time-sensitive in it, literally just the sub-names