Look for a Dahua or Hikvision DVR and cameras. Put the DVR (and cameras if they are IP) on its own isolated subnet that doesn’t have any internet access. Use a VPN to access it remotely.

Don’t buy them from amazon, buy from one of their authorized distributors. I learned that the hard way when I ended up with a grey market camera with no warranty or firmware updates.

WiFi cameras are much easier to jam if someone wants to break in without being recorded. Don’t use them if you can run a cable.