that's not really the same thing, what you are describing is redundancy so failure in one (or more) place doesn't bring the system down. Backups are about prev

that's not really the same thing, what you are describing is redundancy so failure in one (or more) place doesn't bring the system down. Backups are about preventing data loss. Data loss can happen in many different ways, not just a system crashing and burning. It can be deliberately/accidently done such that it would be sync'd everywhere.