EHD Failure

Well, it happened. The click-click-click of a seek error on my 2T WD Mybook. Countless recordings of shows probably never again aired in my lifetime. Life goes on, but to protect myself in the future:

1. Is anyone using a mirrored EHD with their hopper? What model & what's the drive capacity?
2. Is anyone routinely cloning their EHD for archival backups? If so, what's the software and techniques you're using.

Thanks!