They have plenty of security concerns, but for this a few cheap Wyze cameras would be perfect. Even with no subscription you get motion alerts.
Home Automation
Home automation is the residential extension of building automation.
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Look into the Reolink brand
buy any ip based camera. use no-ip.org (I renew every month and don't pay a fee). then use tinycam app to view for free.
I just use cheap IP cameras, Frigate, and Tailscale for remote access. Monthly cost is zero, upfront cost was a Coral, I can check live feed and events whenever I like. Mine runs on a server I already had running, but I have an embarrassing number of cameras, and if I didn't have the server, I'd have just thrown Debian and Frigate on an unused computer. You don't have to enable the motion or object detection if you want only live feed; just don't put it in your config file. You can also control how long events (if you record them) are stored.
Home Assistant is a bit overkill for this, but if it was me that’s what I’d do. Any camera with RTSP can be integrated and then you can setup an automation to take a snapshot from the camera every x minutes. You could use the Google Drive Backup integration to upload the folder with the snapshot however often and then you have immediate easy access to them.
So am I the only one who keeps my old cell phones or tablets for a few years.
I've used them as makeshift webcams and nanny cams a few times.