this post was submitted on 10 Jun 2023
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Interesting. I think Lemmy only caches thumbnails, but it pulls images from the instance that the post/comment is from.
A beehaw admin said their instance only is taking 25GB total
Yeah there are basically trade-offs that need to be decided. You shouldn't need a server farm to start a new small instance, but on the other hand, if everything gets hotlinked from the big instances that can also lead to problems. It also means that when the large instance begins suffering from performance problems or downtime, it directly impacts other instances with broken images and stuff.
I think part of the design decision made by Mastodon was to make it so users don't have to send any requests to third party instances, which may or may not be operated with malicious intent (I'm not 100% sure on this, though). There are alternative projects like Pleroma and Misskey which provide a very similar federated microblogging format but aren't as heavy to operate.