It's false regarding data center alternatives for disaster recovery, a mobile site is the least expensive option but at the cost of the longest switchover time.
Mobile sites are very flexible, have relatively short turnover times, and costs vary widely by size and capacity. A cold site is the cheapest option but has the longest switchover time as all hardware, software, and data must be loaded to the new site.
A disaster recovery plan need not only include recovery procedures. This should include detection measures to be able to warn of incidents and preventive measures to avoid disaster in the first place.
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