Zoneminder is a pretty solid setup for IP security cameras, and the zmninja app is really nice too. I had tried it years ago but got back to it recently with some sketchy IP cameras. I just put them in their own VLAN, no Internet access, Zoneminder does motion detection and event recording, and so far I’m quite pleased with it.
As of right now, no. It’s relatively new as I understand. The feature to record only events is a planned addition. As of right now it records 24/7 and records events. I have 7 cameras currently set up, a 7 day set of recordings takes about 1.5TB. This includes many 1080P and 2K resolution cameras.
Again no I’ll intent towards frigate, I needed something more plug and play and LOVE the plug-in functionality of it as well. I’m also already using it for HomeKit integration so it was an easy transition to making it my frigate replacement.