Run your own instance, subscribe to every community, then backup the db.
this post was submitted on 23 Dec 2023
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datahoarder
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As far as I have searched, I didn't find a way to find "every" instance. Most of the popular ones - yes, but far from all.
Also I did not know that each instance copies all pf the data of all other instances into their own db.
But thanks, I will try it out next year.
There's no authoritative list of instances since federation isn't required, but tools like lemmyverse.net will give you a solid list of the ones discoverable from the most well known federations.