Thank you :) This was the best of the 2 worlds. I was a bit reluctant because of the name (nextcloud) but after 2 days of hard searching, docker tinkering, cronjobbing and a few lost hairs It fits quite good. Except it doesn’t work with todoist but jtx board seems promising and is not proprietary, so maybe I will make the switch :).
I edited my post accordingly, for other users stumbling on the post (also making lemmy more active 🌤 )