Time Machine and NAS: Cannot create backup image

I'm wondering if anyone else has encountered this problem when setting up Time Machine with a NAS. I'm using a Thecus N4100 Pro mounted via AFP. I've enabled Time Machine on unsupported disks so that I can select one of my NAS shares as the backup destination. So far so good. Time Machine attempts to create a backup and ultimately fails because it cannot create the backup disk image. Any idea what's going on?
I just set up a Time Capsule for my parents and it worked very well. I've thought about replacing my AirPort Extreme with a TC if I cannot get Time Machine working with my NAS. However, I'd rather use the NAS for obvious reasons (like, I already own it!).
Can anyone point me in the right direction? Or will this not work?
Thanks!
-Rob

A little searching of the forums answered my questions on setting up Time Machine to work with my NAS. However, I still have one question I hope someone can answer.
The instructions I found describe creating a sparsebundle and copying it to the NAS before Time Machine will work. To create the bundle, one must use the Ethernet ID of the computer. So, what if one is using two network interfaces (ie: WiFi and wired Ethernet)? I prefer wired Ethernet, but use WiFi as well when I'm on the couch, etc.
If I set up the sparsebundle using the WiFi Ethernet ID, will that prevent me from backing up when connected via wired? Or vice-versa? How does Time Capsule handle this?
Thanks,
Rob

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neillhowell wrote:
I've noticed that when Time Machine runs, that a folder called Data at /Volumes/ appears while Time Machine is trying to back up. I think it's making the sparsebundle to transfer to the Time Capsule.
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