The maximum size of the replicated volume should not exceed 2 TB.

You can replicate a single volume instead of an unlimited number of volumes.

In Windows Server 2016 there is the possibility of using Storage Replica only if you use the Datacenter Edition as operating system version, while in Windows Server 2019 there will be the option to enable Storage Replica also adopting the Standard Edition, but right now, with the following limitations: What's new in Storage Replica in Windows Server 2019

This article will present the news, regarding Storage Replica, that will be introduced in Windows Server 2019 and you will be shown how to enable Storage Replica by using the new management tool Windows Admin Center. This technology also allows you to create stretch failover cluster with nodes spread over two different site, keeping in sync the storage. If you use your own certificate, make sure the name provided in the certificate matches the machine name (wildcard certificates are not supported.) You are also given the choice to let Windows Admin Center manage your TrustedHosts.Storage Replica, in Microsoft home, is a technology introduced in Windows Server 2016 that you use to replicate, synchronously or asynchronously, volumes between servers or clusters, for disaster recovery purposes. If you use the generated certificate, it will match the DNS name of the server. The installer can create a self-signed certificate for testing, or you can provide the thumbprint of a certificate already installed on the computer. You must specify the port that the service listens on, and it requires a certificate for HTTPS. On Windows Server, Windows Admin Center is installed as a network service. Install on Windows Server with desktop experience

Right-click this icon and choose Open to open the tool in your default browser, or choose Exit to quit the background process. When you start Windows Admin Center for the first time, you'll see an icon in the notification area of your desktop. When you start Windows Admin Center from the Start menu, it opens in your default browser. If you choose to forego this setting, you must configure TrustedHosts manually.

Modifying TrustedHosts is required in a workgroup environment, or when using local administrator credentials in a domain.

Windows server 2019 admin center