If you want to create redundancy at least two VMs networked with a load balancer is the recommended solution. Some links here:
https://learn.microsoft.com/en-us/azure/virtual-machines/windows/tutorial-load-balancer
https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-overview
https://learn.microsoft.com/en-us/azure/load-balancer/tutorial-load-balancer-standard-manage-portal
HTH