HT1427: Mac Basics: Time Machine backs up your MacLearn about Mac Basics: Time Machine backs up your Mac
Currently Being ModeratedDec 29, 2012 4:01 PM (in response to Peter Dromgoole1)
Perhaps you are thinking of a RAID setup that uses multiple disks with duplicate data for backups. This is meant in situations where data security needs are high and that a HDD failure would result in irreparable loss, usually financial. For general use it is not necessary. Time Machine coupled with a bootable clone will do nicely.