I logged onto my multiplayer server to find my house with all my chests, etc has been reduced to sand. Other areas of the map have been "filled" with stone, etc. but it seems to be random. The fountain and garden by the house is fine. Or a portion of a bridge is intact. I am not sure how to troubleshoot the issue, I use a host for my server, but was not making regular backups. For some reason I thought it was automatic. I don't know where to start.
Building Reduced to Sand