1. A system configured to validate a database including deduplication information, the system comprising: one or more computing devices each having one or more hardware processors and configured to: determine that a current version of a first database is invalid, the first database including information about a set of deduplication data blocks, wherein the deduplication data blocks are used to create deduplicated secondary copies on one or more secondary storage devices; obtain a previous version of the first database; retrieve a first data fingerprint from a second database, the second database associated with a storage management computer, the first data fingerprint corresponding to a secondary copy job which resulted in the generation of a secondary copy of a file, the first data fingerprint comprising (i) an indication of a first count of unique data blocks stored in the secondary copy of the file and (ii) an indication of a first count of references stored in the secondary copy of the file that reference data blocks stored in other secondary copies; generate a second data fingerprint using the obtained previous version of the first database; compare the first data fingerprint with the second data fingerprint; and in response to a determination that the first data fingerprint and the second data fingerprint do not match, rebuild the first database using the secondary copy of the file.