Rear brake noise

Did you do the last brake job?
if so did you lubricate the contact points with proper grease?

does it make the noise when sitting still in the garage?

the first thing is would do is pull a tire and pull a drum and see what it looks like in there.
I did, probably been 6 years now. I think I lubed contact points, been awhile. I'll open them up and take a look, might be basic maintenance.