Can I back up an external drive and an airbook with a third drive

I would like to back up an external drive and an airbook with a third drive.  This was the setup I used with my Imac.  The third drive was linked to the external drive which was linked to the imac.  I used time machine.  Both the third drive and the external drive were visible on the desktop of the imac.  Now I want to use this system to back up the airbook and the external drive, but the third drive doesn't appear on the airbook's desk top, in fact it is invisible and doesn't seem to be recognized in finder or anywhere else from the airbook.  Is there some distinction that prevents the airbook from allowing this back up configuration, but that allowed the imac to work in this configuration.
Thanks,
Daviiiiiiid

Of course, always that the external drive is formatted in “Mac OS Extended (Journaled)”. Apart from that, you shouldn't have any issue,
Then, open System Preferences > Time Machine > Options, and remove the external drive from excluded items. The next backup will include your external drive.
Note that you may not be able to back up the external drive if it's connected to your Time Capsule. If it doesn't work, connect the external drive to your computer

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