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Docs for context: https://docs.immich.app/features/mobile-backup/

It does and it’s seamless for me. Which takes the angst out of “should I keep this photo or video” once your phone is old and full out of the equation.

Easy read but indeed. That's what I read the article for. I'm very happy with Photoprism but the box is not always on and I'd like to keep a cached set of photos on my phone while also having automatic (multi-user) sync whenever the box is available..