Back up plan? What planet are they on?
In the old days it took tens of thousands of well trained clerks occupying endless rows of desks to run a handful of simple account types. Now banks have hundreds of flavours of their "product" the reality is I.T. IS their business - without it they don't have a business - and yet still, management consider I.T. to be a "cost" to be slashed away at - even though the business could not possibly function without it. It also shows just how out of touch the regulatory bodies are to suggest modern banking could switch over to manual! There is no plan B - rapid recovery of the service is the only feasible course of action and is where the focus should remain.