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Amcrest IP4M-1041B + Home Assistant
(www.amazon.com)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
Thanks for the clarification, my ideia was to run the cameras on an isolated VLAN so, no issues with calling home. I just wanted to make sure they can be operated fully locally.