What I use is an old PC running a NextCloud instance. It has an SSD for the OS and the data sits on a ZFS pool made of two HDDs in mirror mode. I chose ZFS beca

What I use is an old PC running a NextCloud instance. It has an SSD for the OS and the data sits on a ZFS pool made of two HDDs in mirror mode. I chose ZFS because I was worried about silent data corruption (it happened before in my large photo archive even if it isn't nearly as large as yours) and because when I set this up, there was still a lot of discussion on whether BTRFS was reliable or not. If you wish to replicate this now, I think you should re-evaluate BTRFS (assuming you will be using a Linux distro). For the cloud backup, I think that you will be saving money by using backblaze [1]. As for the solution for posterity, if you're worried about the possibility of next generations not being able to pay, the only solution I see from the top of my head is to print the photos. Given the amount that you have this would be a daunting task, so only print the ones that you find the most valuable and look for a "safe and stable" (whatever this means... :D) place where to store them. [1] https://www.backblaze.com/b2/cloud-storage.html https://www.backblaze.com/b2/cloud-storage.html