Backups are risky. Backups rarely work, are never current, and take time. Businesses lose millions per hour for downtime. Businesses need real-time failovers. Backups stopped being economically viable over 15 years ago. We now can afford failover systems instead.
At the enterprise level like Colonial, yup... but look upthread - you really want to try to explain failover systems to some of these people? :P
In the SMB world, backups with spare gear is still more common and fits both the reasonable requirements and the budgets.