A customer is planning unattended backups of multiple branch offices. They do not need off-site storage, but rapid reserves are essentials? Which backup storage technology should they implement?

Disk-based backup targets such as virtual tape libraries or deduplication appliances require no manual media swaps, making them ideal for unattended multi-branch backups. Because disk allows random access, restore operations are significantly faster than sequential tape reads, directly satisfying the requirement for rapid recovery without the complexity of off-site tape logistics.

Local tape drives require someone to manually load and change cartridges, making truly unattended backup impractical across multiple branch offices.

SAN-attached tape libraries are expensive, require on-site infrastructure at each branch, and still have slower sequential-access restore times compared to disk.

Network-shared optical jukeboxes have very slow access times, limited capacity, and are not a practical choice for enterprise backup workloads requiring rapid restores.