Well.... I have caused it to crash a few times when using World Edit commands on a very large scale and also when I clear my plot. Although it usually doesn't happen that often, I could see it happening a few times each week because of those reasons alone. This is not to mention the server restarts and other crashes or bugs in the systems that might also be at fault. All-in-all, these situations are to be expected in minecraft servers, and should not be regarded as too serious unless in quick succession or for large time intervals. I do however appreciate your concern on the matter, as being cautious will pay off in the future. If anything strange occurs, it would be best to contact a server administrator or check the forums, as most information about this is usually posted. Do not worry, there is nothing wrong with Buildbox at the moment :D