How can using PoE to power cameras help keep them running during a power outage?

PoE cameras use less cabling, allowing backup power supplies to last longer 

PoE cameras are centrally powered from the Ethernet switches which are backed up by uninterrupted power supply (UPS) 

The PoE standard requires connected devices to include backup batteries, to allow for network dropouts 

Since PoE cameras are centrally powered by the server, you will only need to add backup power to the server to keep the system running