When you enable replication for an Azure VM, the following happens: 1. The Site Recovery Mobility service extension is automatically installed on the VM. The extension registers the VM with Site Recovery. Continuous replication begins for the VM. Disk writes are immediately transferred to the cache storage account in the source location.
Azure Backup Azure Backup is the Azure-based service you can use to back up (or protect) and restore your data in the Microsoft cloud. Azure Backup replaces your existing on-premises or off-site backup solution with a cloud-based solution that is reliable, secure, and cost-competitive.
Azure Load Balancer: ( from AZ-103 Trainer Book ) The Azure Load Balancer delivers high availability and network performance to your applications. The load balancer distributes inbound traffic to backend resources using load balancing rules and health probes.