[2020] Pve server with no decay, whole build disappeard next time my sis logged in

Hello @Alathariell, welcome to the forums!

We’ll need additional details in order to determine what could’ve caused this, such as what sort of messages your sister had in her Event Log, the server settings regarding building decay and abandonment if this happened on an online private server, the location of the building and more information regarding its setup ( building pieces, were they all connected through foundations, screenshots ).