Installing I/O Filter
To be able to protect VMs with CDP, you must install I/O filter on each cluster where the VMs that you plan to protect reside and where replicas will reside. For more information on the filter, see Source and Target Hosts.
To install the filter on a specific cluster, open the Inventory view. In the inventory pane, navigate to the Virtual Infrastructure > VMware vSphere > vCenter Servers > <vCenter Server Name> > <Cluster Name> node and right-click it. In the menu, select Install I/O filter.
If vSphere LifeCycle Management is enabled for your cluster, you need first follow the instructions from this section and then follow the instructions from this Veeam KB article.
To install I/O filter on multiple clusters in a vCenter Server, use the I/O Filter Management wizard.