The term storage system describes a system supported by the d.ecs storage manager typically consisting of hardware and software components, on which d.3 or ecspand documents are written for secondary storage. Among others, these could be a NetApp system with SnapLock or an EMC2 Centera system. Every supported storage system is addressed via a specific d.ecs storage manager module. The module(s) must be selected and installed during the d.ecs storage manager setup. Every storage module or storage driver is either designed for exactly one or for several storage systems by one specific vendor and must not be used for compatible systems by other vendors. Examples for this could be the d.ecs storage manager modules Celerra and NetApp. The module Celerra can be used for EMC2 Celerra systems with File Level Retention option as well as for EMC2 VNX systems with File Level Retention option. The d.ecs storage manager module NetApp is designed for storage systems by the company NetApp (so-called FAS systems) with SnapLock-Enterprise or SnapLock-Compliance and must not be used for other compatible systems (SnapLock-compatible) by other vendors.