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I had no backup, as I always considered my MicroSD as an external storage medium for such data.
I know you’re not looking for advice that would have been great before things went wrong, but… When they say to have a backup up on external storage, they don’t mean make the backup and then delete the original. Then the “backup” is just the original.
Also, I don’t think that microSD life expectancy is that great. I wouldn’t it trust it as a sole keeper of backups.
Good luck.
That doesn’t sound like a design that would work in an apartment building. How do neighbouring apartments connect?
Maybe you can draw it out? My guess is that it’s actually just a big rectangle when you figure out where the bathrooms and closets are.