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Alternative to Google Photos
(lemmy.blahaj.zone)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
Another vote for syncthing. It just magically works in the background and is very reliable. I take a photo on my phone and within seconds it's on my Photos library on my computer. (gThumb and/or Shotwell for Linux work well. )