Backing-up an external HD

Hi,
I have *OSX 10.5* installed, running with *Time Machine* backing-up on a *Time Casule*. Works fine.
The problem is that I also have an extra *external HD-drive* connected with my mac. The Time-Machine is not backing-up this extra external drive. Why? What did I wrong?
grtz,
Ief

Open the Time Machine pane of System Preferences and remove it from the exclusion list. If the option to do that isn't available, it's in a format Time Machine can't back up, such as FAT32. In that case, back it up manually or with third-party software which can back up to network drives.
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