What you want to do is create a bonded interface. Here's the Red Hat way:

http://www.cyberciti.biz/tips/linux-bond-or-team-multiple-network-interfaces-
nic-into-single-interface.html

And the Ubuntu way:

http://ubuntuforums.org/showthread.php?t=1423602

Yes, that will help with network throughput. However, in my experience the 
limitation on BackupPC is checksum calculation and compression. My server and 
most of my clients are connected via gigabit ethernet. However, 3 simultaneous 
backups rarely exceeds 60 mbit in total. The best way to get that number up is 
to beef up the CPU and RAM on the backup server, and run several simultaneous 
backups.

Regards,
Tyler

On Wednesday 09 June 2010 15:26:19 Jaco wrote:
> Hi Guys,
> 
> Would I be able to setup two nic's on my backuppc server to improve
> network transfer performance to the backuppc server.  I usually have a
> least two backups running at the same time on this server.  If this
> would be beneficial, what would be the right way of setting it up?
> 
> Thanx,
> Jaco
> 
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