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I'm very happy with the way it came out. Not a single squeek and extremely solid! Some say that you should use thin set between the plywood and cement board. This would be one way to do it as well.
Is your floor level? I would say that since you have toung/groove floor on the joists, that you could use a thinner 1/2 plywood or OSB. As for the backer board, you could go 1/2", but 1/4" would probably do the trick. Depends on how springy your floor is.
I'm assuming you took a good thickness of flooring out to get down to the t/g subfloor?
If your floor is springy, then I would use the 1/2" cement board for sure, but if it's solid, you could go with 1/4" plywood and 1/4" cement board. I would glue the plywood to the t/g and either thinset or glue the cement board down. Make sure you use plenty of screws.
It's 6 of one in my opinion...