The Ugly Truth
All the various hospitals I've visited or gotten care from in the last 20 years or so have stripped themselves of the ability to effectively provide service when their computers are down. They've migrated away from paper files, films, and mainframe-based systems to MS-Windows based Electronic Medical Records systems.
Having gotten rid of all that paper, they have repurposed the records storage rooms, and have nowhere (secure) to put printed-out medical tecords, even if they had a way to print them out quickly-enough, which they don't.
In the one EMR system I know some internal details of, they did not budget for alternate hardware. They may have a hot-site agreement of which I'm unaware.
Their primary weak point is their network. No comms, no data flow to/from their thin clients (Citrix) or from their realtime patient-monitoring systems.