With the advancements in RAID and storage systems, how come RAID still isn't a replacement for backup?

RAID information RAID levels defined Do RAID levels still matter? How to calculate available disk space on a RAID 5

RAID protects your data, so if a drive fails you can continue to access it. If all your drives fail, where are you going to recover data from? To protect yourself to a particular recovery point objective [RPO] and recovery time objective [RTO], you still need to combine RAID and backup.

Check out the entire RAID FAQ guide.

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RELATED CONTENT Frequently asked questions When should I use the different levels of RAID? RAID is 20 years old. Is it as applicable today as it once was? With a shift toward solid-state disk and semiconductor memory-based storage, does that diminish the need for RAID to boost performance? Can you explain what dual parity, distributed parity and network RAID are, and why are they getting more and more attention? How can RAID be used to address green IT issues, and power and cooling challenges in the data center? What are the performance issues with RAID 6 or dual-parity schemes? Is RAID only relevant for the enterprise, or should SMBs and SOHOs be concerned with RAID? Where is the best place and best technique for implementing RAID? It seems like 'hybrid' drives will be here long before true 'solid-state' drives. How do hybrid drives play into RAID schemes and tactics? What's happening with disk rebuild times? How do 'preemptive rebuilds' work, and what other techniques are appearing, if any, to accelerate rebuild times?

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