What are the steps to discover it knowing ONLY lets say “lemmings.world/post/10530999” and nothing else. If that is not possible, then knowing title “Dead Lemmy instance, how/where to find backup of the post that was on the offline instance?” and mentioned URL, while not knowing parent community name or the instance from which the post originated.

I think that when I am having link like https://lemmings.world/post/10530999 or knowing a title of the post, i can not discover in which community it has been posted… When I check same number of post on different instance: https://lemmy.ml/post/10530999 it does NOT work. Yet the search works: https://lemmy.ml/search?q=10530999 is there no other/easier way than opening one big instance after another (for example from the list https://lemmyverse.net/?order=posts&open=true ) and use search like that?

https://programming.dev/search?q=Dead Lemmy instance%2C how%2Fwhere to find backup of the post that was on the offline instance%3F&type=Posts&listingType=All&page=1&sort=TopAll

Search by post, paste title, make sure you’re searching all communities and not just local.

Or paste the URL in the search. Thanks to this post’s suggestion.

https://programming.dev/search?q=https%3A%2F%2Flemmings.world%2Fpost%2F10530999&type=Posts&listingType=All&page=1&sort=TopAll