1. A storage management system for unified snapshot management, the storage management system comprising: a storage manager comprising a storage policy; a first client computing device in communication with the storage manager, wherein the first client computing device comprises a first executable component and an associated first data agent; a second client computing device in communication with the storage manager, wherein the second client computing device comprises a second executable component and an associated second data agent; a storage array in communication with at least the first and second client computing devices, wherein the storage array hosts at least one logical unit number that comprises primary data generated by the first and second executable components; a first subclient that represents a first part of primary data generated by the first executable component, wherein the storage manager comprises an association between the first subclient and the storage policy; a second subclient that represents a second part of primary data generated by the second executable component, wherein the storage manager comprises an association between the second subclient and the storage policy; and a snapshot of a logical unit number resulting from a unified-snapshot job managed by the storage manager based on the storage policy, wherein at most one snapshot of the logical unit number results from the unified-snapshot job regardless of the number of executable components that store respective primary data to the logical unit number.