Backing up an external HD with that has the operating system on it.

My Hard Drive in my Imac has become too small so I have been running the imac from a larger external hard drive. Is it possible to connect Time Machine to back up only the external drive with the OS on it. It wants to back up the internal Hard Drive as well which is not what i want.

Check in System Preferences>Time Machine. You should be able to exclude the internal drive.
~Lyssa

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