If you have a single server pulling of a plug (or even any HW failure which cannot be fixed quickly) is a very rare even (unless you use cheap desktop hardware

If you have a single server pulling of a plug (or even any HW failure which cannot be fixed quickly) is a very rare even (unless you use cheap desktop hardware instead of a decent server with ECC RAM, hot-swap HDD, redundant PSU e. t. c.). If instead of using this single server (with manual fail-over in case it would fail) you'll start to create complex HA cluster from multiple servers not having enough people to properly design, test and maintain it you can end up having a less reliable system.