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I use Syncthing to synchronize between my phone and desktop.

It's a little confusing to set up the first time, but I've had it on this phone for 3 years and not needed to fiddle with it.

(It uses its own protocol.)

Yup, after years of trying to make nextcloud, syncthing, etc work for my workflow (copy from flat photos folder on device -> flat photos staging folder on backup server, then a cron job organizes it into folders by year/month), I finally resorted to something manual. Termux + rsync on android. Every few days, I run the termux shortcut to rsync a folder, and delete what's copied over from my device. It just works.

PhotoSync is actually very good: https://www.photosync-app.com

I really like the iOS version too. With a shortcut I back up all my photos straight to my own SFTP server.

Is that opensource?