This document summarizes the findings of a case study comparing the 5-year total cost of ownership (TCO) for 4 disk array solutions and 4 software-defined storage solutions for backup to disk. The study found that SUSE Enterprise Storage 4 provided the lowest overall 5-year TCO that was $181,457 less than the most expensive solution from EMC. SUSE offered multiple layers of cost savings, including using standard hardware, low annual software licensing fees spread over 5 years, and support included in the license cost. The study concludes that software-defined storage solutions can provide disk backup for half the cost of branded storage arrays.