Time Machine Not Automatically Running

This seemed to start a few days ago. My Time Machine works fine, but for some reason it's not automatically doing the hourly backups. I can manually run the backup, which I do several times a day, but it won't start automatically.
Haven't made any software changes. I've done the Software Update, restart, with no luck. I looked around in the Time Machine preferences but didn't see anything useful.
Anyone else ever experience this?

Hello Rob:
Anyone else ever experience this?
No, but that does not mean you do not have a problem.
I think the first thing I would try is trashing the preference file (com.apple.timemachine.plist) and then restarting.
Barry

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