Saving modified map in game

I’ve always wondering something. A friend told me, some months ago, there was a game where you could modify the map and it automatically save for everyone. Like, you add a wall somewhere and new servers would contains that wall. My question is, how to do a data store like this, whenever a player changes something it get saved? I already have Data store 2 in my but saving every changes of the map would require a huge amount of keys.

You have to send a message from server to server, please read the following article for more explaination:

A few things I’ll point out:

  • If a new server is created it should receive all the data all the other servers already have
  • If the last server is closing you should save the data