RAID is a technology that allows you to combine the storage drives into a single array, which helps to prevent data loss if one of the drives gets broken.
RAID comes in various kinds:
• RAID 0, used to combine two or more drives in a single array. More common in personal data storage, rarely used in business due to instabilities and proneness to failure.
• RAID 1, a.k.a. mirroring. The second drive becomes a carbon copy of the first one. If any of them fails, all the data can still be restored from the other one.
• RAID 10 (or RAID 0+1) is a combination of two RAID 0 arrays into a RAID 1 array. You basically get a combined array of two drives, as well as its backup copy.