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 have mine set up so it onld syncs my photos to the pc, but not the other way round. Photos are always copied to my pc and I can safely free up space on my phone