In one example, a system that is operable to back up and restore data may include a high efficiency storage application configured to back up a chunk of data of a client system to a content addressed storage system by generating a recipe that includes instructions for generating the chunk of data from a plurality of data pieces. The system may further include a backup server communicably connected to the high efficiency storage application and configured to, among other things, in response to receipt of a restore request, recover the chunk of data by retrieving the recipe and appended storage addresses in one index seek without separately looking up a storage address for any of the plurality of data pieces in an index.