This video talks about why it's essential to set up Fail Over Service in ServiceDesk Plus and includes the workflow, pre-requisites, configurations, and the complete FOS implementation for new installations.

The following links will guide you through the procedures to follow when you upgrade or restore ServiceDesk Plus.

Upgrade - https://help.servicedeskplus.com/failover-service$upgrade-fos
Restore - https://help.servicedeskplus.com/failover-service$restore-fos