AmbiguousProps

So much for keeping the US out of war…

You can host remote files via SFTP + cloudflared (or another reverse tunnel provider) without opening any ports. Then you use a file manager to add a network share with your SFTP information.

For the calendar, WebDAV is probably your best bet, which also works with reverse tunneling. You can also use WebDAV in place of SFTP if you prefer to only have one (or two with a reverse tunnel) service configured. Nextcloud is a great option since it has WebDAV and file management built in.

I would use Docker to do it all, but there is a learning curve associated with setting all of this up in a secure way (which is what the reverse tunnel helps with).