Does TM/TC backup external hard drive connected to usb-port of TC?

I have searched the web to find a straight forward answer to this question, but unfortumately have not been able to find it.
The situation is as follows I want to make room om my Mac by copying my local iPhoto library (230Gb) to an external hard drive connected directly to my TC (2Tb) trough the usb-port (which is already up and running). Before deleting the original library I want to be sure that Time Machine also backups the contents of the external hard drive too. And if not, if there is an alternative way of backing up such external hard drive easily, apart from making a hard copy manually.
Thanks a lot.

Before deleting the original library I want to be sure that Time Machine also backups the contents of the external hard drive too.
Time Machine cannot do this.
Instead, connect the USB drive (formatted in Mac OS Extended (Journaled)) directly to your Mac's USB port and move the iPhoto library to that location.
Then, Time Machine will be able to backup both your Mac and the USB hard drive.
Click the Time Machine clock icon at the top of the Mac's screen, then select Time Machine Preferences.
Click Options. By default, you will see that the hard drive is in the list of Excluded items, and will not be backed up.
Click the hard drive to highlight it, then click the - (minus) button to remove it from the list of Excluded items.
Time Machine will now back the drive on the next pass.

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