You can buy government bonds - very little risk involved in terms of price change, and your money is safe from a bank collapse then - that is, even if the bank fails, they just forward all your bonds to a different bank.
Also, if you're under the insurance limit, you're safe. If bank insurers fail because too many banks fail, then the currency won't be worth paper it's printed on anyway.
Also, if you're under the insurance limit, you're safe. If bank insurers fail because too many banks fail, then the currency won't be worth paper it's printed on anyway.