For buyers contracting authority
Pick 72317000 when the contract's main purpose is keeping data safe and retrievable rather than processing or transporting it. Storage arrays, SANs, backup and archiving, disaster recovery and managed cloud storage all sit here. If the deliverable instead moves data between systems, that is Data transmission services (72318000); if it transforms or analyses the data, look to the analysis sibling (72316000) or the parent.
The practical complication is bundling. Several of the awards here are not pure services at all: they fold in the storage hardware, its installation, data migration and a multi-year support wrap. The titles bear this out, with awards covering supply and installation of a storage system, the purchase of a storage and backup system with associated services, and the supply of a modular data centre. Where a single contract mixes hardware supply with the storage service, keep it under 72317000 as long as holding and serving the data is the dominant purpose, and reserve the equipment codes for deals that are purely about the kit.
One boundary worth flagging: the hardware itself, media storage and reader devices, is 30233000. Use that for a straight goods purchase with no managed-service element.