In some cases, it isn't the best choice to place all systems in Azure, for example, when using applications or systems that have a high demand on latency. In those cases, it is necessary to keep the system on-premises, but Azure could still offer support in those situations with disaster recovery or failover options.
For this example, we look at Windows Server 2016 and the new feature storage replication. With storage replication, you can perform asynchronous storage replication from one Windows Server 2016 to another.
In our case, we place one server on-premises and one server in Azure. The on-premises server is the primary target and replicates to its partner in Azure. That only produces incoming traffic and your clients still connect to the on-premises server. The following diagram shows an abstract of the workflow:
As soon as the on-premises server fails, your users will be redirected to the system within Azure. For most applications...