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.
I use syncthing to sync music, notes and pictures between my phone and my PC. It’s ridiculously efficient and it feels like using your devices’ networking features in a reasonable way at last. It’s so simple and feels so good. I fucking love it.