Yeah, just as separate drives. That's what I always thought JBOD meant, and that spanning was concatenation. RAID0 I know means striping, and RAID1 is mirroring.
1) new SATA card <$50, 6x 1.5TB drives for backup ~$400
2) 12+ RAID card ~$600-$800, 2x 1.5TB drives for RAID6 ~$150
3) 2x 4-drive...