Optio is designed to be used as a complete system (Optio cameras with an Optio NVR) and this makes it an excellent option for small home/business systems. At the same time the Optio cameras are ONVIF compliant and so you can connect them to 3rd-party recording devices, and a common 3rd-party option is a Synology NAS which a lot of people already have in their homes & business for general file and media storage. Synology NAS devices have their own security software called Surveillance...
How to use Optio Cameras with a Synology NAS
How to use Optio Cameras with a Synology NAS