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Lemmy on a raspberry pi
(lemmy.world)
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this post was submitted on 26 Jun 2023
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I would also add that Lemmy is part of the fediverse, meaning it is federated. Federation means all instances "talk" to all instances (unless they defederate), so you aren't limited only to the content on one instance (or in some cases not even Lemmy, case in point: I'm posting this from my kbin.social account).
same!
What happens to posts/comments and any media/content that is hosted on a server that just goes away (for example if I created one virtually and then deleted it or if a sdcard on a pi is corrupted)
If you upload an image to that server, the image will be gone. Your comments will still exist on other federated instances, assuming that instance was federated in the first place. But any replies to those communities will not propagate once the hosting instance is offline.
For example assume you have 3 instances, A, B, and C. You have an account on A and create a post to a community on A. At some point A goes away, but those posts and that community will still exist on B and C. So you create a new account on B, and reply to one of those posts... users on C won't be able to see those replies as A isn't there to broadcast those replies out. And if someone on C creates a new post on that community from A, you wouldn't be able to see it on B either.
P.S. The same is true if A just decides to defederate instead of shutting down. (other than the images and accounts would still exist obviously).