Estimated disk space required drastically different between Hikvision cameras - IDENTICAL SETTINGS | Synology Community
Hikvision 32CH NVR DS-7732NI-K4 [4K Ultra-HD 32 Channel Network Video Recorder, ONVIF PoE H.265 Power Over Ethernet Protocol, Support 2MP/4MP/5MP/8MP CCTV IP Camera] Optional:4/8/16/24 Port PoE Switch, Furniture & Home Living, Security
Amazon.com : 6MP PoE Security IP Camera, Compatible with Hikvision DS-2CD2163G2-I, Dome EXIR Night Vision, 2.8mm Fixed Lens, H.265+, English Version Firmware, Upgradable : Electronics
Downloading Video from Hikvision NVR without the Motion and Intrusion Lines | IP CCTV Forum for IP Video, network cameras & CCTV software