I use syncthing to sync all my photos and a few other bits and bobs to my local NAS. Works wonderfully.

I also took that setup to allow me to sync some selected media back from the NAS to my phone.

This way I am not reliant on cloud services as the primary store of my personal data, and I don't have to use their export tools to get my data back. I back up the original sources directly from the phone to my own infrastructure.