Getting Time Machine back up to a Sparsebundle on external HDD (Drobo)

Hey,
I've been chasing this issue around for a while but can't seem to find the answer.
There are a lot of resources out there describing how to get your Mac to backup to a Sparsebundle on a NAS, and more resources telling you how to write protect the Info.plist file so that Mac OS doesn't resize the image to take up all of your NAS.
However I've got a Drobo connected directly to my Mac Mini. The Drobo pretends to have a 16TB drive so that you can add storage as and when you need it.
I am already using it to back up my MBP over the network to a Sparsebundle and until recently I was using the same scheme (a size limited sparsebundle) to back up the Mac Mini that the Drobo is connected to.
I achieved this by following the excellent directions on http://anitechtalk.wordpress.com/2010/07/19/time-machine-dns323/ (one of the only sites that mentions the new way that Apple handles Time Machine Sparsebundles)
However this has recently stopped working and no matter what I do I still cannot get my Mac to see the Sparsebundle as a TimeMachine aware 'drive'- instead it just backs up to the root of the '16TB' Drobo- and at some point it's going to get rather full.
Argh.
(And yes, I know that the other solution is to re-partition my Drobo to have a small partition at the start of the disk for Time Machine to use- but it's too late for that as I've already got 1.85TB of data on there and I doubt that I can re-partition that without losing all of the data.)
Can anyone help me get Time Machine to accept my Sparsebundle as a 'disk' that it can backup to?
Thanks in advance.

Thank you for the video link. I did it pretty much exactly the way the young man explained. The one thing I didn't do was click "customize" as he does and unclick the multiple language support and he also clicks "rosetta" to support older programs. I wonder if that's the issue? The guys at Macmall told me that I would need to update the o.s. before I restored. I did that originally but have since (as mentioned before) erased the main drive. I noticed that when he does his install, his external drive does not show up on the list in which you want to install the o.s. on... should I unplug my external? I'm just trying to look at ever detail. I know the recovery file is there. The one thing it (the external) did say before I started posting here was "in progress". I'm not sure what that means? I promise I'm not an idiot. I consider myself an above average user. I usually help other that have issues... but I've yet to restore from a Time Machine back-up and I'm looking forward to learning how to do it.... the right way. I appreciate all of the advice. I have some pretty important files on my external back-up. I am really hoping that this is possible. I'm beginning to think the external is where the issue lies. The "in progress" next to the file name concerns me. I know there's a lot of data on the drive because it's nearly half full. So there's stuff there....
Deep breath in...... reeee laaaaaaaxxxx

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