I have a question on one of the DR scenario,

Lets say I have 14 TB database in oltp mode with no/least performance problem. (yes weired but lets accept it). Now lets say the system goes down because of any problem, and I have the valid set of latest backup. I can start restoring but the problem is how to meet the objective of RTO (recovery time objective) of 3 hrs. As restoring this ~tb size of full backup will definately take time to restore.

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I know there should be some faiover configured like replication,mirroring,cluster-failover or logshipping(least preferred). Or should have some offline site where backups getting checked and restored in time.

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Lets assume because of any reason these options was not considered and the only option now is restore. What would be my strategy to bring this database online within RTO?