Im confused as to what back-powering actually is - I have a four port powered hub (The one recommended by the foundation) I have a cable plugged into one socket of the hub, and the other (micro) end going into the Pi2's power input socket, is this back powering? to my knowledge the power protection is on the Pi's power input connection, so Im not circumventing this am I? I've run the PI2 like this with no problem for around four months.
Pi 2 running LibreElec Krypton, Pi 2 running Wheezy Desktop, Pi 1 headless Wheezy, downloading Radio, Pi 1 running Picore headless Media Server, Pi Zero to be an Old Time Radio Project. Pi 3 testing. Pi Zero W downloading Radio shows headless.