Why do I get messages telling me that Time Machine has not backed up?

I have a Macbook Pro with Yosemite 10.10.1.   Time Machine sends me messages that my computer has not been backed up in hundreds of days.  I just attached the hard drive two days ago and the light was on.  All instructions say Time Machine works when you plug in your hard drive.  How can I tell if it actually backed up my computer?

Hello!
Open: "Apple menu > System Preferences > Time Machine" It will state there why a back-up has failed.

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