I have. I set up an iptables firewall rule that allows access only from my home IP.

Don't you want to access it from your phone when mobile?

If I need access while I'm away from home, I go through my home VPN. This is what I do on my cell phone.

Why not just buy a NAS and keep it at home?

You would get way more than 20 GB.

This would be a good idea if I had decent upload bandwidth from home. When I'm on my cell phone, I'm generally syncing smaller things.

Does your home VPN not have the same bandwidth limitation?

There are OpenVPN clients for android that I use to access private LAN resources.

But I have in fact also left my nextcloud on the web. I'm not that worried.

Just have to stay informed on any big vulns, and I also stay as many releases as I can behind the bleeding edge. That helped me avoid the recent fidokey issue.

What was that issue? Link?