Have you heard of [syncthing](https://syncthing.net/) ? It syncs a folder between devices, like Dropbox, without the need for someone else's computer. No cloud, it's just your pc talking to your phone, directly and automatically, through your home WiFi.
This is how I use kubernetes (specifically Harvester HCI and some lighter RKE2 nodes). Just one big computer lots of nodes. Still working getting the plumbing fully figured out for virtual desktop to output video devices.