this post was submitted on 05 Jul 2023
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I would imagine that the caching that Lemmy does has been tested in court, since the intent of the cache isn't to create a permanent copy of the data. It would likely only become a problem with GDPR if that data would stay across the instances.
As far as the federated server is concerned, the copy it has is canonical and kept forever until such a time that it receives an edit/delete signal from the original instance. I'm not really sure if you could plausibly call that caching, but I'm not a GDPR lawyer (or any variety of legal professional, for that matter) ๐คท
I don't see this staying in Lemmy as the federation grows. I can't see admins being able to sustain these costs.
Well... that's just kind of how it has to work. Storage is cheaper than bandwidth and it's not a close contest. Historically, storage costs have fallen faster than networks have grown and it is probably safe to assume that this trend will continue indefinitely.
FWIW: The stuff that gets federated is all text. Image uploads aren't federated at all -- those are just shared as URLs which point to the instance wherein they were originally uploaded. This is actually why things like avatars are currently so unreliable on Lemmy -- they can't scale well without there being local copies.