Originally Posted by
scottishpoet
But your backup strategy should be built around downtime your business can afford.
Back in the days of PRS, the predecessor to FLY/Altea, BA had a backup DCS, called "Demerel" o something like that. It would take something like 20 minutes to spin up, but then the impact on the operation in case of an outage was measurable in terms of 50+ cancellations.