Time Machine Backup of USB Hub connected HDD

Hi all,
I've got 2 HDD's connected to my AEBS through a USB hub. One is for TM backup, the other for extended storage. Is there a way to include the latter during backup?
TM is working fine wirelessly through the AEBS, and both drives mount at startup in my finder, but there is no evidence of it being included in the backup/sparsebundle. The extra drive is not in TM's excluded list and it is Mac OS journaled.
Anybody trying this setup with any amount of success?
Thanks.

Yep, trying to include the extra storage disk in the TM backup. I realize I can connect the disk to a backedup Mac as a quick fix, but need the extra storage disk to remain an airdisk for remote access, independent of my computer.
So, I'm guessing there is no way to include it as long as it's sharing a spot on the AEBS's USB hub?

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