Time Machine not backing up other external hard drive

Hi,
I recently upgraded to Leopard and am trying to use Time Machine. I have one external hard drive that is used specifically for the Time Machine Backup, it's called "Backup Drive". The other hard drive is called "Captured Memories" and is used to store my graphic design files. Time Machine seems to backup my iMac because there is a folder called iMac and it contains the files, but the folder for Captured Memories is blank. I was getting errors saying that the backup failed but when I clicked the "Back Up Now" option on Time Machine, it doesn't list the error - but the Captured Memories folder is still blank so it didn't back up that external drive. I also changed the Spotlight preferences so that it does not search the Backup Drive.
Both the Backup Drive and the Captured Memories drives are the same, they're both Seagate Free Agent Pro drives, 1TB each.
The Free Agent Pro drives both have a sleep timer that I cannot adjust, does that have anything to do with why Time Machine won't backup the Captured Memories drive? If that is the case, what other software can I use to backup the Captured Memories external drive? I want it to sync to the Backup Drive because I am constantly saving and moving files around on the Captured Memories drive.
I was using a Memeo backup software that came with the Free Agent Pro drives but the problem I was having is it would make copies of files rather than move them. For example, I have a folder on the Captured Memories drive that is called, In Progress and one that is called In Proofing. So once a project is complete, I move the file to the In Proofing folder. The Memeo software would copy the file to the In Proofing folder rather than move it. So I'd end up with 2 copies of the file, one in the In Progress folder and one in the In Proofing folder.
Does anyone know how I can simply have the drive backed up like that?
What do I do?
Please help! I really need to make sure that the Captured Memories external drive is being backed up!

I am having a similar problem. I initially set it up 3 days ago and had it back up just the iMac to Time Capsule (about 120 GB) which it did no problem (I initially had my LaCie drive excluded). I then un-excluded my other drive, where all my photos and music reside (about 130 GB). Since then, it keeps trying to back up about 102 GB each time. Looking at the list of backups it does not appear that it has ever successfully backed up the LaCie. I am not aware of any error messages, but I have not been home much. I normally shut down the computer at night but I have been leaving it on trying to let Time Machine do its thing. All I can say is that every time I am at the computer TM is running and it always looks like it is in the middle of backing up 102 GB (usually seems to be near the beginning, never seem to see it more than halfway done). Looking at the TM panel it says the latest backup was 2 days ago. I'd appreciate any advice!

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