Yes, you can use 4 or 8 rechargeable AA batteries as backup. 

It will NOT track the moving objects when motion detected. Just APP notifications push, spotlights and siren alarms, depend on your settings. 

You can view photos and videos from this WiFi trail camera without removing it from the mount. And you can set the camera in the APP. This is very useful for cameras mounted in high places or hard-to-reach places. 

Hello, this trail camera can provide 4K video and 30MP photo. It's clear enough to see what you're shooting with this hunting camera. So you get clear images even in the dark. More importantly, this hunting camera has WiFi connection and APP control. That means you can use the APP to preview and download photos on your phone. It's so convenient. 

First, you need to check whether the camera battery is sufficient. When the battery is below 30%, you cannot take pictures at night. You can see the battery in the lower right corner of the camera screen; then format the memory card; find the delay in the menu Take pictures, note that the factory default setting is 30 seconds, but if the animal stays in front of the camera for less than 30 seconds, the picture will not be taken. You can try to set it to 8 seconds, 5 seconds, etc.