Via AWS Blog, zBox is a PowerPC-based NAS box that automatically backs up itself to Amazon S3, so that you have the short latency advantage of LAN storage, and redundancy of online storage at the same time. They can even detect degrading disk drives and send you a new one preemptively. After several disk drive incidents over the years, I think it's a perfect solution. Except it's a bit costly -- $49 a month for a 30GiB drive? Maybe I'll continue to use this hacked rsync script to my DreamHost account.