Very good backup medium

I run the hard drive to an AirPort Extreme Base Station as a Time Machine backup. The hard disk is much faster in reading and writing, as it will bear my network ...
She works almost silently in the corner in the living room and does not bother. It runs so far very reliable. In addition, they also switches on Airport Extreme (not only on Mac / PC) when not in use into hibernation. It bothers me personally a little the Mac modeled pulsating lights, because it is relatively bright.
Price / performance is ok, because the housing is, albeit partially made of plastic, very stable and vibration damping. But there are definitely cheaper alternatives - but would be rather unpleasant for a backup due to its reputation to me.