How do I use Time Machine to backup a network drive

Let me clarify up-front... I DON'T want to use my NAS as my Time Machine backup drive. I want to backup my NAS to another drive using Time Machine. Here is my current configuation:
iMac 27" with 2TB HD backed up to a Firewire Drive using TM. I swap out an exact duplicate of that drive once-a-month and keep one of these drives off-site for disaster recovery.
I want to add a 3TB NAS drive for all of my media. But I'd like to backup ALL of the media on that NAS the same way that I backup the iMac, with TM -- routinely swapping out 3TB backup drives and keeping one off-site for disaster recovery.
In a perfect world, I could do this in the cloud. But transfer speeds and cost preclude me from choosing that option.
Here are my questions:
1) Can TM work on the 3TB NAS, standalone, to allow it to backup to that set of new 3TB backup drives?
2) I currently have a brand-new Hitachi 3TB HD in an older PowerPC Mac Pro. Could I fire that up and share it on the network as an NAS? I know I could run TM off of that configuration. But, I think that I would be compromising speed and performance vs. the new NAS drives out there. Am I wrong? Also, I'm not sure if that configuration would allow me to stream reliably as a UPnP server.
I know it's a long-winded request, but I would really appreciate the insight of others who have possibly solved this problem. Thanks!

Time Machine will only back up internal and directly connected external drives. It will not back up a network attached storage device.  You'll have to use some other software to back up the NAS.

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