Make a copy of a Minecraft world?

I have a big minecraft city and I wannw play it on survival too. I don't want the world to get destroyed and I don't wanna not autosave it cause I wanna keep playing it on survival. How do you do this?

Heres the offical way from the original creators

https://help.mojang.com/...r-computer

Another way to get to the minecraft folder is to press your windows key and search %appdata% on the bottom. Then there should be a folder named ".minecraft" (notice the dot). Then refer to the site above.