Australian banks are backed up by the government so your money is safe.
I don't fully agree that they would honor that commitment as the government also has huge "off the books debt" the guarantee is for a limited amount and the practice of overseas banks is that they just shut the doors and limit what you can have so if property dropped 80% you may not be able to get your own money to take advantage of the opportunity
Also Australian banks have a legal right to take a portion of your funds to pay their debts
Banks started going backward when they sacked all the experienced staff and put uni grads in their place. People who run banks now don't have the ability to run a fish and chip shop successfully