I'm currently hemming and hawing over upgrading the drives in my server. I've got a pair of 4TB drives are are mostly full, and it looks like I could upgrade to 10-12TB for less than $300 (I also have a new chassis that I might put into service at the same time which can hold a lot more drives, plus my wife's old CPU and MOBO would be a decent side-grade, so maybe I'll also shift to RAID-Z1 with 3-4 drives over time and an external backup drive via PBS now that it officially supports external drives)