

I’m not sure myself, there seems to be better software out there for each individual part of what nextcloud does, but not the whole thing. I’ve been reading up on open cloud, which is a fork of a rewrite of owncloud, which is what nextcloud is forked from. https://opencloud.eu/en/opencloud-community
I haven’t tried it out yet though.
Just create a black hole network at your house and connect all ‘smart’ appliances to that. Block all traffic at the router level. This prevents them trying to connect to open mesh networks and also provides the benefit of cataloging all the traffic