@DiegoEspinoza - Yes, this is our warm spare setup as shown up at https://sangomakb.atlassian.net/wiki/spaces/PG/pages/20873219/PBX+GUI+-+Warm+Spare+PBX+15+Setup .
However if you are using virtualization I would recommend backing up the VM frequently, and then this backup can be restored to another hypervisor in the event of a failure. This is much smoother to restore a VM backup then use warm spare in most cases. The reason is the warm spare needs a different IP, meaning you would need to have your phones fail over to a secondary IP and same issue with all port forwarding and ITSP connections. Or you would have to change the IP of the warm spare to the PBX’s IP in the event of a failure. This will all work of course, but simply restoring a VM backup and powering it up is much easier.