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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.
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Syncthing is another good option. I've never used NextCloud, though, so I'm not sure which is better.
Syncthing is great if you wanna to sync everything inside a folder, i've used in the past to backup savefiles of drm free games, but for photos nextcloud is a better option since work almost the same as google photos auto finding the folder with images and asking kf you wanna to sync them instead of doing manually