Nooo ur documents. Not ur private key lol (it wouldn't exactly be private now, would it). Let's say u lose ur private key. U would have to manually do shit like u do when u lose ur passport.
What I'm saying is, ur identity being deleted only if the government AND u lose all ur data on all devices at the same time. Which is incredibly unlikely.
It's like saying, "I don't trust a papered system because the state buildings and my house could burn at the same time with my documents in them"