evcc is an energy management system with a focus on electromobility. The software controls your EV charger or smart plug.
Available at https://translate.disroot.org and installable on your own server, online or offline.
It requires Node.js, so maybe not something that works on (free) shared web hosting.
you can switch from sqlite to mysql, and potentially between most two combinations
This utterly failed when I tried to create a deployment of Nextcloud. Possibly it had to do with the template being from 2021, with Nextcloud version 23.
Lots of video content management, but some interesting apps and utilities to consider.
webtrees is a web application that allows you to publish your genealogy online, collaborate with family members and take control of your data.
freemium
Simple scheduled rsync/rclone might be enough, for just the Files data, but would that get notes/calendar/contacts?
Would syncing the whole thing and restoring to another URL actually create a working duplicate?
Also to consider is WebDAV mirroring/sync
- davfs2 plus rsync seems like the most active and robust option
- gvfs supports DAV mounting also
- Duplicati can sync to a DAV server, but would use local files as the source. This seems to preclude syncing CalDAV/CardDav data, too.
- vdirsyncer can sync CalDAV/CardDav (which should get tasks)
-- seems to be slated for replacement by pimsync