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Alternative to Google Photos
(lemmy.blahaj.zone)
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If you can setup a small server (nothing fancy, an old refurbed office PC does just fine) you can setup NextCloud. I use it for a Google Drive/Photos replacement. Doesn't have as many nice features, but it works if al you want is archiving.
You can also check out the Self-Hosted Git Guide, there is a whole section for Photo/Video management. https://github.com/awesome-selfhosted/awesome-selfhosted#photo-and-video-galleries
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
Is there a capability of having stuff on the cloud, but not locally, but they will still be accessible on the phone given the computer/server is on and that I'm online on my phone.
EDIT: See if I had a half decent computer, but with a decent storage (let's say 1tb) and I had on all time - could I potentially use it as my own self hosted cloud?
To your edit:
Yes.
Yes, i did with my old pc, i used zero tier one to connect with it from outside my wifi, sadly a storm came while i was at work and it fried the motherboard