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about the rear brakes, not nessasery to do them.
pointless will be a better word
you can upgrade the back if you put a 320mm bbk on it with 4 pot calipers or higher, just for keeping the f/r breakbalance a bit in order.
otherwise it will be just fine to keep the back standard, if you want to improve it, keep youre money and put better discs and brakepads on the back.
more as efficient enough