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.
Yes I know Syncthing but I cannot aford to have the same 200GB of files on 4 different devices. I need the space.
You can set connections between folders to be one-directional. That way after I send stuff to my intended device I wipe it from the source device and it stays where it was intended to go.
I’ve found LocalSend really nice for this purpose. If you need to send stuff over your wifi to other devices but not sync it in the background it’s really nice
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