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this post was submitted on 20 Aug 2023
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Also, all data isn't stored on every Lemmy I stance, only (or mostly I guess) where it is relevant.
As long as 1 person from an instance is subscribed to a community, that person's instance will fetch everything that happens inside that community (and keep storing it even if they later unsubscribe, unless manually purged by an instance admin)
So not everything everywhere but quite not that efficient ...
Thanks for the explanation.
Right, which on a side note is most of why I have accounts on a number of different instances and regularly switch between them - because each instance is at least subtly different, since they each have different userbases, and thus somewhat different sets of subscribed and thus federated communities.
But if you on instance.alpha subscribe to a community on instance.beta that would federate the community to your local instance, right? Is there something I'm missing?
Right, but of course if you don't subscribe to it (and nobody else does) then it doesn't.
So, for instance, if you go in through an account on a narrowly specialized instance, you're potentially not going to see a lot of the communities from other instances at all, even on their All, just because nobody's bothered to subscribe to them. And you'll likely see highly specialized communities that fit well with that instance that you might not see anywhere else.
The smaller the instance is, the more likely that is.
I have accounts on a couple of small instances on which I haven't even bothered to subscribe to anything, since their All already matches what I want frim the instsnce.