For family use in my case, via docker compose on a Nas. But currently we only / mainly sync multiple calendars, personal contacts for each member. Additionally we utilize nextcloud to sync new photos and keepass files from phones to personal folders of the Nas. Aside that we don’t use any apps as the Nas lacks some CPU power and ram.
Mal ganz praktisch: Was soll eine Hauptstadt an der Klippe eines Landes liegend bringen? Da ziehen die Tiefsachsen mal dran, bringen sie zu Fall und schon wäre der ganze Rest des Landes “kopflos”.