Tony Dye posted some great information defining some really important disaster recovery terms.
RTO & RPO - Recovery Time Objective & Recovery Point Objective
These two definitions should be the building blocks for developing your DR plan and its strategies. If you know how much time that you can live without your data and how much you are willing to lose then you are well on your DR way.
The other major factor in development of a DR strategy is obviously cost. The bigger the number for your RTO and RPO the less you are going to have to spend. As your RTP and RPO approach zero you costs increase dramatically. It is like adding 9's in your uptime or reaching absolute zero. The trickiest part is meeting your expectations to your budget.
Welcome to the PARADOX.
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