How to backup an external hard drive plugged into a time capsule using time machine

How to backup an external hard drive plugged into a time capsule using time machine.
I want to move my itunes library from the mac HD to an external plugged into the time capsule, but I want to be sure this drive will still be backed up by time machine.  I currentlly see no way to do this.

There is no way. You can connect the drive to your Mac and remove it from the Time Machine exclusion list. Then it will be backed up, but that will stop when you reconnect it to the TC. While it's connected to the TC, you can copy it manually to another AirPort Disk by following the instructions here (with a slight modification):
Using AirPort Utility to make a copy of the Time Capsule disk

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    See  >  Setting up Time Machine backups using an external drive
    From Here  >  http://support.apple.com/kb/HT1427
    More Info  >  Time Machine Tutorial
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    This is Not how TM works... It is not a Bootable Clone... Read Here...
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    Chihuahua Rancher wrote:
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