I recently noticed that my nextcloud instance was missing photos. I have the android app set to automatically upload my photos. When I need to clear up space on my phone, I make a separate backup (because I’m a paranoid SOB and hard drives are relatively cheap). I noticed that nextcloud auto upload missed about 10% of the photos. I’m not going to bash the nextcloud devs, as I recognize that I am using a free product and am owed nothing, but I’m making this post so others are aware of this risk. Apparently I’m not alone https://help.nextcloud.com/t/android-client-does-not-auto-upload-all-images/216849/14
I thought with this for years. It’s unreliable and buggy on Android and iPhone. I caved and paid for some photo sync app and it’s been super stable.
That or folder sync on Android. Then feed into immich or photosphere.
I spent many nights running diff and comparing sources and destinations and md5sums and so on