HYDRAstor is a scalable, secondary storage solution aimed at the enterprise market. The system consists of a back-end architectured as a grid of storage nodes built around a distributed hash table; and a front-end consisting of a layer of access nodes which implement a traditional file system interface and can be scaled in number for increased performance. This paper concentrates on the back-end which is, to our knowledge, the first commercial implementation of a scalable, high-performance content-addressable secondary storage delivering global duplicate elimination, per-block user-selectable failure resiliency, selfmaintenance including automatic recovery from failures with data and network overlay rebuilding. The back-end programming model is based on an abstraction of a sea of variable-sized, content-addressed, immutable, highly-resilient data blocks organized in a DAG (directed acyclic graph). This model is exported with a low-level API allowing clients to implement new access pro...