Originally posted by Noxx42:

Why did it even happen in the first place?
I spent a lot of time in my personal world building a base and looking for the caves in the mountain biome only to find out that it's all gone. Of course my first thought was to shut down and launch Steam again, so both of my "backup" files in the LocalLow folder are renewed. I'm devastated :(

It is a game in EA status. By buying this game you should understand that there is a very high chance your world won't make it to full release.
Personally I feel anyone complaining about this should receive some kind of ban from buying games in EA status on Steam . Save a lot of us the headache of listening to the same complaint over and over