You don't need "back to base" in Victoria for CatA/B firearms. It only requires a flashing light and a siren, no cameras and no monitoring. I added CCTV for my own benefit, not because it was required. I don't know what you mean about servers, if I want to view my cameras on my phone they're connected to my own wifi not somebody else's.
Yeah I just double checked and you're 100% correct BR, no B-to-B monitoring is required as far as I can tell for at least Cat A, B, C, D no matter the amount of firearms present in the home. Just read over AS2201.1 2007 to clarify and can confirm it's mostly devoid of the mention of "Monitoring Centre's" other than referring to them as per below.

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I think number of and type of firearms may have something to do with this B-to-B requirement, although I cant find anything in The Act. A mate of mine has some serious stuff in storage, cut a long story short he had to have B-to-B monitoring for whatever reason but was able to remove it as he was able to satisfy B-to-B monitoring conditions by installing a modern security camera system in that it alerts someone (him) of a breach, has a siren and external flashing light.
HikVisionOn the topic of Security Cameras and HikVision servers, there's oodles of info on the web on HikVision and their nefarious activities over the years i would avoid them unless you're in the market for a thermal camera, they've had several years of practice and fine tuning the technology on their own people and their thermals are good and don't report back to their homeland CCP.
Here's a quick read that's more relevant to Australia and HikVision concerns https://www.gadgetguy.com.au/banned-hikvision-cameras-surface-in-australia-as-ezviz/