Understanding BNS Storage

Hi, I’m confused about the zonefiles in the BNS system. It seems to me that Stacks is very scalable because it mainly stores the hashes of zonefiles, and not the zonefiles themselves. It seems that the zonefiles are stored in a different network. What is this different network that stores the actual data in the files and what entities are running this network?

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They are stored as attachments in the Atlas network. This data is stored in each Stacks node and distributed peer to peer.