I do not know how much cross pollination there is between Europe and the Russo-Ukranian war communities. But this youtuber has a background in defense economics and has in-depth analysis of a wide range of subjects in the field. This week an update and analysis of the long war is posted and I thought some people that would normally not see this would enjoy these insights.

A lot of the more modern NVR systems can be accessed from the internet. So you can use these.

Synology has security station on their NAS systems (although there is some licensing nowadays depending on model and number of cameras.

Ubiquity also offers local storage for their system, that also offers a bellcam (like ring) and different in and outdoor camera models.

Good luck!