New computer backup hardware

My day job is computer programming and system administration, usually at small to medium sized businesses.  As such, backing up data and planning for disaster recovery is party of my job description.  As you'd expect, that aspect of my job flows over to my home network as well.  I've used the same overly-redundant backup scenario for my computer data for several years now.  I finally outgrew my current hardware recently and had to tweak my setup a little bit to help it scale better at a reasonable cost.  Read on for details.