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After registering I wasn’t even able to pay for a sub to check out their offering for myself. English docs are lacking. I think they are focusing on fr and nl regions. Support e-mail autoreply also only replies in those languages. They are really small scale, ~2000 users by their own admission. Which is ok, but if you advertise a service, at least let people pay for it, so they can start using it, however janky it is.
I can second most of the suggestions. I do not host an office suite (for now?) but I am syncing my keepass dbs over syncthing along with my notes and important documents. I think since 2016 or so. It works well.
Before I had a server I just synced them in a triangle between my phone, laptop and desktop. Most things had 3 copies this way. Any device could offload changes to another. Now I have a central node and the option to sync as before if the server is down. With Tailscale, I don’t need to be on the same wifi now eiter.
The keepassDX limitations are not a big deal if all you need is basic autofill.
Mail providers are hard to chose. I am leaving proton for the lack of easy smtp and their locked in nature. Get your oen domain and you will be able to switch more easily in the future.