MuPDF Viewer works fine for me. Not very feature rich tho.

Running the AV container is optional, as is using the integrated backup solution. But I can see how that might feel bloated if you don’t need it.

With AIO it’s almost the same: sudo docker exec -u www-data nextcloud-aio-nextcloud php occ

I decided to go with this one because it’s now the official distribution channel and supported by the devs. But the lsio one looks pretty solid as well.

This has helped me a lot in my scenario.

Nextcloud is a web-based, open-source cloud / collaboration software suite, which can be self-hosted

Welcome. I use it in conjunction with Fedora CoreOS so I hopefully never have to manually update anything ever again.