Copying World crashes on the switch

I have a long time world called Mango Juice where I have built a lot of things and did all types of different stuff. When I'm backing up this world, I copy but then it stops at 40% and it suddenly freezes. I go out of Minecraft then after 10 seconds I would go back in but the game won't copy the world. So I ultimately close the game then reopen it and try to do it again but it still will not copy for me.