Thx, I have found that the small to medium Lemmy instances are NOT aware about the post, yet most of big instances are. So it fits what has been said: “New posts and comments should always propagate if at least one user is subscribed to the community.” - big instances and old instances has higher likelyhood of someone being subscibed to it prior to me posting the post, so the instance could download that post. Related topic: What are the conditions for the Lemmy post to be distributed to other Lemmy instances?

https://lemmy.ml sidebar shows “4.49K Communities; 129K Posts; 557K Comments” Maybe only admin can discover accurate number of indexed pages by adding their site into a Google/Bing webmaster tools and verifying the site ownership.

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.

Not local data, question is meant from a regular visitor point of view (not necessarily an instance admin).

Thanks, I see that the cross-posting works like this: “In order to cross post, I need to first create the post in one community, then after I create the post, I can click the two nested squares icon under the title of the post (with the pop-up text “cross post”) that shows up on mouse-over.” https://lemmy.world/post/354611