Step 2. Choose Microsoft Windows Server

At the Server step of the wizard, specify server settings for the backup proxy.

1. From the Choose server list, select a Microsoft Windows server to which you want to assign the backup proxy role. If the server is not added to the backup infrastructure yet, you can click Add New to open the New Windows Server wizard. For more information, see Adding Microsoft Windows Servers.
2. In the Proxy description field, provide a description for future reference. The default description contains information about the user who added the backup proxy, date and time when the backup proxy was added.
3. In the Transport mode field, select a mode that the backup proxy must use for VM data transport. By default, Veeam Backup & Replication analyzes the backup proxy configuration, defines to which datastores it has access and automatically selects the best transport mode depending on the type of connection between the backup proxy and datastores.

If necessary, you can manually select the data transport mode. Click Choose on the right of the Transport mode field and select one of the following modes: Direct storage access, Virtual appliance or Network.

4. In the Options section of the Transport Mode window, specify additional options for the selected transport mode:
5. In the Connected datastores field, specify datastores to which the backup proxy has a direct SAN or NFS connection. By default, Veeam Backup & Replication automatically detects all datastores that the backup proxy can access.

You can set up the list of datastores manually if you want the backup proxy to work with specific datastores. Click Choose on the right of the Connected datastores field, choose Manual selection and add datastores with which the backup proxy must work in the Direct storage access mode.

• [For Direct storage access and Virtual appliance transport modes] If the primary transport mode fails during the job session, Veeam Backup & Replication will automatically fail over to the Network transport mode. To disable failover, clear the Failover to network mode if primary mode fails, or is unavailable check box.
• [For Network mode] You can choose to transfer VM data over an encrypted TLS connection. To do this, select the Enable host to proxy traffic encryption in Network mode (NBDSSL) check box. Traffic encryption puts more stress on the CPU of an ESX(i) host but ensures secure data transfer.

6. In the Max concurrent tasks field, specify the number of tasks that the backup proxy must handle in parallel. If this value is exceeded, the backup proxy will not start a new task until one of current tasks finishes.

Veeam Backup & Replication creates one task per every VM disk. The recommended number of concurrent tasks is calculated automatically based on available resources. Backup proxies with multi-core CPUs can handle more concurrent tasks. For example, for a 4-core CPU, it is recommended that you specify maximum 4 concurrent tasks, for an 8-core CPU — 8 concurrent tasks. When defining the number of concurrent tasks, keep in mind network traffic throughput in the virtual infrastructure.