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this post was submitted on 20 Aug 2023
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Fediverse
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All of them. If you can see it from an instance, it's stored in that instance.
The only exception are images which may or may not be stored depending on the exact backend software and configuration.
Both "alpha" and "beta" has authority to hide the post (one hosts your account and the other hosts the community) from the rest of the federation. Similarly, both "beta" and "gamma" have the authority to hide the comment from the federation. That said, instances can also individually hide/purge stuff from their own views without affecting the wider federation if they so choose (which is how things like .world's blocking of piracy communities work)
"beta" handles distribution/"boosting" (in masto speak) of the post and comment to other instances (however "gamma" will send it to both "alpha" and "beta" as it's a reply to "alpha"). AFAIK "alpha" and "gamma" handle the boosting of the upvotes they receive from "delta" (though I could be wrong on that part).
Oh, and "boosting" doesn't mean "i got 1 new upvote on this comment :3" it means "delta has sent me this exact Like event owned by person@delta associated to comment@gamma (and a lot of other data)". There are also keys and signatures involved to make things a bit harder to spoof.