US Patent 9633056 Maintaining a deduplication database

An information management system can modify working copies of database entries residing in a local database of a secondary storage computing device in response to instructions to modify the database entries residing in a deduplication database. If the working copy does not already reside in the local database, a copy of the database entry, or portion thereof, from the deduplication database can be used to generate the working copy. Based on a desired policy, the working copies in the local database can be merged with the actual database entries in the deduplication database.