Firestick and PVR

Hi, I am very much a newby to all of this, so sorry if this is a daft question, but….

I am in the UK and have a Firestick plugged into an older large screen TV and working well now. It has KODI 16.1 installed. I did have lots of issues with it seeming to loose access to my wifi AP, but that now seems to have resolved itself. I notice in the KODI’s settings a mention of PVR, is there some way to enable the PVR please? I have a 1Tb Buffalo USB hard drive, plugged into a USB port on the router, which is accessible to other items on the LAN.

I saw mention of being able to backup the Firestick (or maybe just KODI), where / how would it back itself up to please?