You can have foreign currency accounts. I had one,but the anti money laundering rules made them difficult to use. I've closed them.
btw - banks don't actually store money, they just create ledger entries. There is no asset value backing your accounts, and the balances are owned by the banks, and not by you.
The loans they give out are of value.
You’re wrong, they inflate the money sure but they can store it/print you “new” money if the old stuff is misplaced...