Unfortunately, there is no documentation about this scenario from VMware and Microsoft. However, I have managed to run backup on separate network to make sure that my backup traffic flows over that network only. Below are the steps that have to be configured.
1) Put DPM server in separate backup network subnet.
2) Create new vmkernel adapter in same backup network subnet on ESXi hosts running protected VMs.
After above steps when you run backup, ESXi will automatically use backup subnet for backup traffic.
There is no need to add additional network adapters on protected VMs.
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