A RAID does not increase the risk of a drive failure. It via redundancy reduces the risk, but not to zero. Probability of Single Drive Failure > Probability of

A RAID does not increase the risk of a drive failure. It via redundancy reduces the risk, but not to zero. Probability of Single Drive Failure > Probability of Double Drive Failure. RAID is not a backup, so still need that backup. 1. Without RAID, drive fails and you're stuck waiting for restore from backup. 2. With RAID, risk double drive fails < risk of #1 and are stuck waiting for restore from backup. 3. With RAID, risk of single drive fails > 0 and < #2 and continue working while waiting on drive clone while still having the backup in #1 and #2 to fall back on.