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RAID is not a panacea. RAID does not allow you to skip backups.

That is because it isn't a substitute for a backup system. Many people think it is for some bizarre reason. Even if you mirror your data amongst 5000 drives it doesn't prevent you pressing delete on the wrong file or formatting the wrong partition.

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- Making a large single volume that is bigger than the largest available disk drive.

- Faster data access.

- Ability to have continuous uptime when a single hard disk in the array fails (at the expense of heartburn and worry as you pray for no additional failures while waiting for the replacement drive to be shipped).

These are the reasons for using RAID. Nothing else.