Where is the save data in pc?

The game worlds are saved in the Storage folder (Path: /Steam/steamapps/common/Eco/Eco_Data/Server/), your configs in the Configs folder at the same place. That's all you need to copy to continue the world as it was.

Provide the crash log to [email protected] as described here: https://github.com/StrangeLoopGames/EcoIssues/wiki/Getting-the-Eco-server-and-client-log-files-for-local-world