Using SSDs as asecondary cache(sometimes called a “flash cache”) helps:

Improve read performanceby storing frequently accessed data in the faster SSDs.

Reduce latency for read requests because SSDs are much faster than traditional spinning hard drives (HDDs).

Power consumption (A): SSDs do use less power, but the primary goal here is performance.

Data backup (C): SSD cache doesn’t impact backup operations.

Storage capacity (D): This is not the main focus; the SSDs act as a cache layer only.