dappydan

Hello, I am new to this site so please forgive me if I am posting this in the wrong place, I currently have a Hikvision DS-7208HFI-SH DVR and I am looking into installing a NAS drive. First question is, do i need a specific NAS or will the WD my cloud i al;ready have work? also can i use my NAS drive for storing pictures from my pc and my DVR use it, or have they got to be independant of each other? Thanks