I know this is an apocalyptical question and there's a lot of redundancy in place, backups etc.
But I am curious about what are the mechanisms in place and if nowadays there's still any physical copy of ownership, so let's say in a cyber warfare a brokerage loses all its data, datacenters wiped out.
What are the mechanisms outside of the digital world (if any) that exist to provide a robust redundancy to avoid situations that customers lose all of their stocks and have no way to prove you ever owned them.
