So You Want to Try a Backup Network?

So You Want to Try a Backup Network?

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What is a Backup Network?

A backup network allows backup traffic segmentation from your primary network.  Keeping backup traffic off your production network allows you more bandwidth for your day-to-day work without having to wait for off hours to get backups of your data.  This does not mean that you will not see potential performance issues as the servers are backed up, but the impact will be much less.


DPM Backup Network Scenarios

Let us look at a scenario when a backup network would be advantageous




This is a simple backup network.  As you can see, the DPM Server connects to the production network and the backup network.

This will reduce the amount of traffic on the production network by forcing all backup traffic onto the backup network.

When setting up your backup network:

1.       You must have either a DNS server in the production network or hosts files on the servers.  If you choose to use a DNS server you must not create a DNS sub-domain.  The DNS server must be accessible from the backup network.

2.       Insure that DNS name resolution for the PS on the DPM server can resolve the backup address of the protected server and vice versa. (Use NSLookup using FQDNs to check)

clip_image004 Important: When setting up the backup network it is necessary to include the address range of all protected servers on the backup network.

Configuring a Backup Network

To configure the backup network you need to insure that NSLookup <FQDN of the Protected Server> resolves to the backup network and vice versa.

Here is the following from the DPM Powershell Console

Add-BackupNetworkAddress [-DPMServerName] <String> -Address *.*.*.*/subnetmask [-SequenceNumber]




The IP address or subnet mask of the network


-DPMServerName  <String>

Hostname of a DPM server


Specifies the priority of the address for use as backup


The chart above lists the necessary parameters to setup a backup network.

An example of setting up a backup network follows:

Add-BackupNetworkAddress -DpmServername <DPMServerHostName> -Address -SequenceNumber 1

This will add the address range as the backup network for the DPM server.

Once the commands have completed successfully, it is necessary to restart the DPM Agent on the Protected Servers and to restart the DPM Service on the DPM Server.

For more information, see the TechNet Library Article:

Using Backup Network Address:

Walt Whitman 
Senior Support Engineer
Microsoft Enterprise Platforms Support

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  • We recently installed Backup 2008 on our Server 2008 Enterprise. We also installed a PCI-E card, and external drive box, and created a software RAID5 drive of it. (Drive B: for Backup)

    When we opened Backup 2008, it did not list the drive letter as an available destination, on the drop-down list - just the DVD-R and a small USB hard drive that was plugged into the unit.

    Is there a way to get Backup to allow the use of this drive as a resource?  

  • Would it be possible for someone to explain in more detail how the second DNS entries for the all the Protected servers and DPM server so not cause problems with other production network traffic. Is it simply the network binding order?

    Alternatively if using host files how do you tell the servers not to use the backup subnet for non-backup traffic?

    Thank you.

  • Hi I can to this over the iSCSI Network with the Hardware Snapshot?