Best answer: Redundant Array of Independent/Inexpensive Disks (RAID) is a technology that allows storing data across multiple hard drives. The purpose of RAID is to achieve data redundancy to reduce data loss and, in a lot of cases, improve performance. The best way to get in on the RAID action is with a NAS.Great dual-bay NAS: Synology DS218+ ($299 at Amazon)NAS for mass storage: Synology DS1618+ ($719 at Amazon)Great HDD for RAID: Seagate IronWolf 4TB ($160 at Amazon)