Nextcloud.
Either self hosted with old hardware, or by a service provider.
Linux Mint is a free Linux-based operating system designed for use on desktop and laptop computers.
Want to see the latest news from the blog? Set the Firefox homepage to:
where is a current or past release. Here's an example using release 21.1 'Vera':
https://linuxmint.com/start/vera/
Nextcloud.
Either self hosted with old hardware, or by a service provider.
Easiest, most secure and I would say most Linux style solution: Syncthing (https://syncthing.net/).
It's used in apps like anytype.