Good post by W.Curtis Preston (thank you)
Disaster recovery experts do not agree whether you should have one-and-only-one recovery time objective (RTO) and recovery point objective (RPO) for each applicaition, or two of them. What am I talking about? Let me explain.
What are RTO and RPO, you ask? RTO is the amount of time it should take to restore your data and return the application to a ready state (e.g. “This server must be up w/in four hours”). RPO is the amount of data you can afford to lose (e.g. “You must restore this app to within one hour of when the outage occurred”).
Read on here