NAS for Home

Dear Lazyweb,

Does anyone have suggestions on what to use for centralized storage at home? I have a lot of music/photos here piling up and would like to put them on some energy-efficient NAS box. Ideally it would have some sort of of built-in backup solution as well. A lot of the NAS-in-a-box solutions seem to have RAID 1, but that really only helps for HA. I am more concerned with never ever losing this stuff than having it available 24/7.