Off the top of my head I'd say that if you're budgeting for storage, the max you can afford for the time period that you'd need to recover data in the event of

Off the top of my head I'd say that if you're budgeting for storage, the max you can afford for the time period that you'd need to recover data in the event of a budget overrun taking into considerations the delay time for notifications would be a way to calculate that. And that sounds like something that is reasonable to put on the customer to calculate.