@nichtsicher that depends what this company is doing. It is a not a question of how to replace a specific computer, it is a question of the whole system behind. Riscmanagement and so on. E.g. if you are a hospital and have to manage data and timeplans for patients a fallback for a non working database server would be a second server and / or a second, syncronized database server / system. So a fallback solution would be very individual but should be planed if the structure is really a critical.