This is what I could find in the Qlik Sense documentation: https://help.qlik.com/en-US/sense/2.2/Subsystems/PlanningQlikSenseDeployments/Content/Server/Server-Backup-Restore-Site.…
However, I think it would be wise to get on the phone with tech support to help guide you through this process because there is a lot that could go wrong, especially with your certificates, tokens, and active directory.
When I had to move my Qlik Sense Server I had to plan for a couple days of downtime. I also made sure to back up all of my applications separately before trying to move the software. At that time we had very few users and applications.