With RAID-1 (mirroring) you still should do regular backups. RAID-1
only protects against failure of a HD, and supplies no protection
against failures of any other piece of hardware, or glitches due to
software or environment or fumble-fingers.

For me, most of the on-mobo RAIDs are notorious for such glitches, which
sometimes kill all disks.

So, probably they actually decrease reliability and not increase it.

Backups are the way to go.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation

http://www.storagecraft.com