If you shoot only RAW files, rarely delete, and have been getting into video, consider something expandable. Data Robotics' network-attached Drobo lets you put in four drives up to the current maximum of 4TB ($1,075, street, for USB connections; (www.drobo.com). HP's MediaSmart Server EX475 (www.hp.com) is another expandable option (starting at $690, street, for 1TB). It also has four drive bays, but you can connect external drives for a max of 9TB. Use it to share pictures to the web and other devices on your home network, too. Both of these systems provide internal backup of all your data, while taking up less hard-drive space than mirroring would. For ultimate RAID storage, check out Netgear's ReadyNAS Pro ($3,700, est. street, www.netgear.com), a networked system that lets you share up to 6TB of space online and to your computers at home.