Redundant array of inexpensive disks.

I have it on my net computer, but never bloody bothered with it. Always seemed to be a bit bloody pointless to me, and besides its a backup and storage solution clearly aimed at servers, an answer to the problem of the slowness of tape backup. As a solution it was around long before DVD burners came within the reach of many.

Personally i would much prefer to backup to external HD or DVD and store off site.