I keep my money as cash, in a vault that I had to design and build from scratch in my own home. It's probably not secure against robbery, but it's how I have to store my money to avoid the fact that all the banks are being robbed blind all the time. When I do actually have to transfer money to someone, I go to a bank where I keep a zero-balance account, make a deposit and physically stay there until it clears. Then I initiate the transfer, and as soon as that clears I immediately withdraw any leftover funds from the account and go back home to put it in my vault.
If someone had seriously proposed this as a way they use traditional cash + banks, you'd be laughing at them.