@kaia@brotka.st
I've checked out Radicale that was recommended… to you I think, in another thread, where you were asking about calendars. It's really easy to self-host, I think you can run it on a $2 VPS with no issues, it's wa-ay more lightweight than the likes of Nextcloud — it's just a tiny Python thingie storing everything in the filesystem in fact.
Turns out you can use it for other things with proper software, there is this "jtx Board" application for Android — it can handle journal entries, notes and todo/tasks, all of these seem to be getting synchronised nicely and I can work with them using other software supporting CalDAV.
Radicale itself can function as CardDAV server — so you can use it for contacts too. Here my experience is mixed bag: some software supports photos for contacts in CardDAV, other seems to remove them, but that is a separate issue, Radicale itself is fine.
There is no web interface, so if you want to work with your stuff from browser, you're out of luck — but I'm pretty sure you can solve with a separate thing, I just didn't care enough — not a browser person.
And it's really easy to set up — took me less than an hour, the tutorial even gives you hint on how to put everything under version control so if something goes wrong you can undo the damage: https://radicale.org/v3.html

@mergan@pleroma.viridianpatriots.com