A method for doing live backups of physical hard drives is to set up a RAID array, however doing so will diminish the hard drive's capacity. Would you rather have backup at the cost of using up half your disc space, as an alternative? Which kind of RAID is the best option for a home computer system that often experiences power outages that might lead to hard disc failures?

A method for doing live backups of physical hard drives is to set up a RAID array, however doing so will diminish the hard drive's capacity. Would you rather have backup at the cost of using up half your disc space, as an alternative? Which kind of RAID is the best option for a home computer system that often experiences power outages that might lead to hard disc failures?