I pretty much do as Peter does, rotate hard drives out the KiPro, off load them using FW 800 to a RAID drive. Doesn't take to long to move 200GB over FW 800, I do like the esata solution though, I'll have to look into it. Fortunately , I don't have any PC's in the mix, makes things a bit simpler. You may want to think about using CD's nano-flash. I haven't used it, but my workflow is Apple based, right down to FCP. My supplier is trying to get me to use these as replacements to the KiPro when I have clients not using FCP, perhaps using AVID instead.
Link:
http://www.convergent-design.com/Products/nanoFlash.aspx
Cheers,
Phil Senger
SW Audio+Visual
Vancouver, BC
http://www.sw-online.com