I'm using nextcloud for files and photos/videos sync from mobile, Joplin for notes and tasks, baikal for calendar (with sharing with my wife which using iOS/macOS).
There is nothing better than Nextcloud for files, I was trying to use syncthing and seafile - both sucks in one way or another.
Also, I was using vikunja for tasks but it's UI and UX... Well, strange and not eye-candy. I hope someday they'll rewrite it.
Go always with software RAID where possible to avoid vendor lock-in.