When I was a Sysadmin at a MSP, we had client with 2 main sites and multiple satellite sites. At one of the satellite locations there were two servers. The first ran a bunch of VMs and the second was the backup. If you disconnected the backup, the AD stopped working everywhere and half of the NAS storage was not reachable. As a far as anyone knew the second server was set to spin up replacement VMs if the first went down and nothing else. We were a pretty shitty MSP and never spent any time doing proactive work. So when that server dies, that company is going to have the most epic outage that will cost them a fortune.
When I was a Sysadmin at a MSP, we had client with 2 main sites and multiple satellite sites. At one of the satellite locations there were two servers. The first ran a bunch of VMs and the second was the backup. If you disconnected the backup, the AD stopped working everywhere and half of the NAS storage was not reachable. As a far as anyone knew the second server was set to spin up replacement VMs if the first went down and nothing else. We were a pretty shitty MSP and never spent any time doing proactive work. So when that server dies, that company is going to have the most epic outage that will cost them a fortune.