Methods, non-transitory computer readable media, and storage management devices that ingest artifacts from applications. The artifacts are stored on storage tiers using storage providers each configured to interface with one of the storage tiers. Metadata for each of the artifacts is generated and stored in a metadata store. The metadata includes a unique identifier for each of the artifacts associated with a storage location for each of the artifacts on the storage tiers. Configurable expressions of a storage policy are periodically and automatically applied to the metadata to determine when one or more of the artifacts should be migrated. The one or more of the artifacts are migrated from a first storage tier to a second storage tier using first and second storage providers configured to interface with the first and second storage tiers, respectively, when the determination indicates that the one or more of the artifacts should be migrated.