HT201250 I want to add another external hard drive to be backed up by time machine how can I do this?

I recently had an external hard drive die on me.  It had all my work files on it, so it was really important to me.  When I went to retrieve the lost files from time machine, it didn't appear to have backed up anything from that external drive (and before anyone asks it's a different external drive to where my time machine files are backed up onto).  I sent my old hard drive away to a data recovery company, and luckily they were able to retrieve all the data.  Now I want to check that my new external hard drive does get backed up this time, but I can't seem to find out how to include this in the back up as it doesn't appear to be doing this automatically!  Any ideas on how? Many thanks

Check System Preferences/Time Machine/Options to make sure the external drive isn't excluded.

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    http://support.apple.com/kb/HT1751
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