Time Machine isn't backing up external drive

I've been using Time Machine successfully for some time now. Recently I decided to move my iTunes music to an external drive (my internal drive was nearly full.) So I moved 150+ GB of iTunes library to the external drive successfully, but Time Machine seems to completely ignore the external (FireWire) drive. It's formatted as Mac OS Extended (that's HFS+, right?) so I don't understand what the problem might be.
Also, if I can get Time Machine to start backing up both drives correctly, should I erase the backup drive and start over? Otherwise, I assume that I'm going to be wasting a lot of (backup) drive space, since the 150GB iTunes library will be backed up from its original location on my internal drive, as well as from its new location on the external drive… what's the best way to deal with that?
Thanks in advance for the help.

Dave Troup wrote:
If V.K.s suggestion doesn't work, try excluding the drive, quitting System Preferences, then removing the exclusion.
Also, if I can get Time Machine to start backing up both drives correctly, should I erase the backup drive and start over? Otherwise, I assume that I'm going to be wasting a lot of (backup) drive space, since the 150GB iTunes library will be backed up from its original location on my internal drive, as well as from its new location on the external drive… what's the best way to deal with that?
You may not need to. TM will, eventually, delete it's copies of anything not still on your internal HD. When is just a question of how soon the TM drive/partition gets near full, and TM must start deleting your oldest "weekly" backups. You are supposed to get a message about that, if you have the appropriate box checked in TM's Preferences, but several folks here report they never did, so assume nothing.
Still, if you want, you can delete all the backups of a file or folder. Enter Time Machine, find and select the folder in question (presumably iTunes on your internal HD) in one of the "cascade" of Finder windows, then click the "gear" icon. That will give you an option to +Delete all backups of <folder>.+
You'll then get a confirmation prompt (may take quite a while, considering the size), then the usual place to enter your Administrator's password. The actual deletion will probably take quite a while, also. There was a report the other day that the item was still visible for quite some time after TM seemed to have finished the deletion, but eventually it did disappear.
Then make some change to the folder, or something within it, so TM will consider it changed and back-up the new (smaller) version.

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