The company I work for has a customer who doesn't care what the cost is to protect the data for their enterprise. Their RTO and RPO are both zero. They demand it. They'll want operational overview but the details aren't relevant nor is the cost. Whatever it takes to accomplish that, do it. Any number above zero costs them millions per minute.
This account has some very stressed but very wealthy Account Sales Reps.
I have seen a lot of companies including global banks that claim that they need 5 9’s and RTO and RPO of zero. That is till they see the price tag. Then things get trimmed back very quickly.
If you have a client that is truely that demanding, you have both a blessing and a curse. And you will likely see things at that account you will not see ever again. Besides, it makes a good resume builder.