How can I tell if Time Machine is backing up my external HD?

Mac Newbie here. I just have a quick question: I have two external HD hooked up to my 2012 iMac, one holding media files (not iTunes, just miscellaneous avi and mkv type files) and the other serving as the backup drive for use with Time Machine. When I first hooked up the media external HD, the OS asked me if I wanted to use it with Time Machine. Interpreting that as a request to use it as the backup drive, I replied "no." Then when I hooked up the second external HD, I replied "yes" when asked if I wanted to use it with Time Machine.
Since that time, Time Machine has been running smoothly, but I'm not sure if it is backing up both my internal HD and my external HD #1 used for media files. When I open Time Machine using Launchpad, it shows me a picture of Finder listing all my different hard drives, but only in the "now" timeframe. When I go back a few backups, the external HD used for media files is grayed out. Does that mean it has not been backing up my external HD files? If so, how do I tell it to include that external HD in the backup process?
Note that I am trying to backup contents of one external HD (including my internal HD) to another - the internal HD has 1 TB, the first external HD has 2 TB, and the second external HD has 3 TB (this is the one I'm using as the backup drive). So I think I should be ok from a space standpoint.

Open System Preferences > Time Machine > Options and see Excluded Items. If the external drive is there, it's not being backed up

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