There's another term for what it is: redundancy. Redundancy is there for fast recovery times (even zero downtime depending on how redundancy is implemented). I

There's another term for what it is: redundancy. Redundancy is there for fast recovery times (even zero downtime depending on how redundancy is implemented). It's not intended to run as a backup as redundancy devices are live and can fail from many of the same causes that will take your primary devices offline (fire, sysadmin fail, etc) Likewise, if your "backups" are always online then it works better for business continuity than it does as a backup. So realistically it's more of a redundancy share.