Ford focus brakes squealing?

My Ford focus from 2006 has gotten both front and rear brakes replaced this year. The squealing or screeching is coming from the rear. It's only when I back up or when I break in general. Sometimes it's quiet and others very very loud. It's not because the brakes are new either. I got the rear ones replaced in January. They are drum brakes in the rear.

Here is what they sound like

I went to my mechanic and he said the brakes are fine. Could this be a lubrication problem? Or could it be my rotors?

You have drum brakes in the back, & they 'self-adjust' every time you put the brakes on going in reverse. You're probably hearing that adjustment.

Always apply anti squeal compound to the back side of the brake pads and they will never squeak.

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