Back end system HA and data replication

Bearing in mind todays all day long outage don't you think you should implement HA on your systems to ensure your customers can continue working even in the event of a catastrophic system failure, and replicate our data to a separate data centre that you can switch too very quickly, if not in real time, so any issues have a minimal impact on our businesses? In the Unix world vendors like HDS and Veritas, this was there bread and butter to ensure continuous availability of critical systems, which as this is your service it should be critical to the generation of your revenue.