Use external IR, also caged. Turn off intetnal IR. Have overlapping coverage of cameras so they can protect each other. Also have tamper alarms set on each camera so that if they're disconnected or painted over you get a text, email, or siren warning. Live monitoring of the cams for intruders also works well. If this seems like too much expense/bother for a Foscam and the property being protected then don't bother with anything except the tamper alarms. They're a great warning that someone is about to steal your cams and/or other stuff.