Explanation/Reference:
In a warm standby disaster recovery scenario, you create a warm standby environment by creating a
duplicate farm at the alternate data center and ensure that it is updated regularly by using full and
incremental backups of the primary farm.
Warm standby. A secondary data center that can provide availability within minutes or hours.
Scenario: Disaster recovery requirements
You must use the secondary datacenter in Chicago for disaster recovery.

You must be able to recover the Chicago.contoso.com SharePoint farm to the secondary datacenter.

Any recovery operations must complete in less than five minutes if the primary datacenter fails.
You must minimize the costs associated with deploying the disaster recovery solution.

References:
https://docs.microsoft.com/en-us/sharepoint/administration/plan-for-disaster-recovery