Deduplicating input backup data with data of a synthetic backup previously constructed by a deduplication storage system

A system for deduplicating input backup data with data of a synthetic backup previously constructed by a deduplication storage system, comprising:

• the deduplication storage system;
• at least one processor device, operable in the deduplication computing storage environment, wherein the at least one processor device:
• constructs the synthetic backup by processing a plurality of metadata instructions provided by a backup application,
• calculates deduplication digests based on the data of the synthetic backup,
• storing the deduplication digests in a digests index,
• calculates and searches, in the digests index, the deduplication digests of new data when new backup data is processed,
• locates matching digests of previously constructed synthetic backups in the digests index, wherein each of the located matching digest references stored data included in the synthetic backup, and the stored data is similar to the input backup data, and
• finds data matches in the input backup data and data in the synthetic backup.

A computer program product for deduplicating input backup data with data of a synthetic backup previously constructed by a deduplication storage system using at least one processor device, the computer program product comprising a computer-readable storage medium having computer-readable program code portions stored therein, the computer-readable program code portions comprising:

• a first executable portion that constructs the synthetic backup by processing a plurality of metadata instructions provided by a backup application;
• a second executable portion that calculates deduplication digests based on the data of the synthetic backup;
• a third executable portion that stores the deduplication digests in a digests index;
• a fourth executable portion that calculates and searches, in the digests index, the deduplication digests of new data when new backup data is processed;
• a fifth executable portion that locates matching digests of previously constructed synthetic backups in the digests index, wherein each of the located matching digest references stored data included in the synthetic backup, and the stored data is similar to the input backup data;
• and
• a sixth executable portion that finds data matches in the input backup data and data in the synthetic backup.