1. A method for creating a synthetic backup by a deduplication storage system and a backup application using a processor device, comprising: providing the deduplication storage system a plurality of metadata instructions, wherein each of the plurality of metadata instructions specifies a data segment of an originating backup and a designated location of the data segment in the synthetic backup; processing each of the plurality of metadata instructions by each of: partitioning each data segment input into each of a plurality of fixed-sized data sub-segments, each sub-segment referencing a plurality of stored sub-segments, for each of the plurality of data sub-segments, during the construction of the synthetic backup, calculating each of a plurality of input deduplication digests based on a retrieved plurality of stored deduplication digests by aggregating calculated deduplication digests of the plurality of data sub-segments to produce a respective one of the plurality of input deduplication digests for each data segment input, locating those of the plurality of data sub-segments in the deduplication storage system specified by the data segment in each of the plurality of metadata instructions, and creating metadata references to each of the plurality of data sub-segments and adding the metadata references to metadata of the synthetic backup being created; wherein the metadata references include physical and logical data patterns; transforming a set of the plurality of metadata instructions into a transformed set of the plurality of metadata instructions; and creating the synthetic backup by the deduplication system and the backup application by consolidating the plurality of metadata instructions that reference adjacent backup data segments into a single metadata instruction; wherein the synthetic backup includes data from an existing full backup and subsequent incremental backups of the existing full backup dating until a specific point in time.