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I’m assuming that by failover you mean Disaster Recovery Plan because the failover concept is related to protective controls that automatically takes over when the main system fails, i.e., it is the first resort in most incidents, while the Disaster Recovery Plan refers to the actions to be performed when main facilities/systems cannot be recovered within an acceptable timeframe (i.e., within the Recovery Time Objective – RTO).
Considering that, the RTO needs to be considered from the time the disruption is perceived by the customer (the RTO is defined from the customer point of view), so it needs to start when the disruption is reported or detected.
What happens is that, for example, if you have an RTO of 10 hours and your DRP needs 3 hours to be implemented, the DRP only needs to be started after 7 hours of the start of the incident, and by this time the teams may solve the situation.
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