After a lot of work, and a lot of trying, I couldn’t find FOSS software that properly syncs my family’s photos in the background (tried Immich, still not good enough despite the new beta timeline, kinda worked in 1.136, got kinda broken on 1.138, tried Nextcloud, but still haven’t gotten new photos to sync in the background. Ente is waaaay too complicated, with waaaay too many moving parts that can break). Given all of this, I gotta choose some prebuilt nas that can properly sync. I don’t like synology but apparently their background sync is ok. What about Qnap and Ugreen? Are they ok?
I use resilio sync to back up my photos to the NAS. Then have scripts to import them into photoprism. Sync runs on two machines so I always have two copies of pictures.
I also use next cloud as a second back up system.