Can Time Machine backup more than just one disc?

I'm new to Time Machine and have set it up to back up my iMacs main hard drive and this seems to be working fine, but I would like Time Machine to back up one other folder on an external hard drive to.
Is this possible?
Hope someone can help.
Pete

Time Machine can back up external HDs, if they're formatted for a Mac.  See how the drive in question is listed in the exclusions box in TM Prefs > Options.  If it's listed in black, just select it and click the minus sign at the bottom of the widow.  Then it will be backed-up.
If it's listed in gray, though, that means it's not formatted for a Mac and Time Machine cannot back it up (and you can't remove it from the exclusion list).  You'll have to copy the data elsewhere temporarily, reformat it, then copy the data back.  See #1 in Formatting, Partitioning, Verifying, and Repairing  Disks if you need formatting instructions.

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