Restore power continuity to supported QNAP 4-bay NAS platforms with a replacement supply built for the chassis it serves. The SP-4BAY-PSU is intended for teams that value fast recovery, predictable fit, and minimal disruption when a primary PSU fails. Instead of taking a storage node out of service for a broader hardware swap, you can return the system to operation with a targeted replacement part. For environments where shared storage supports backups, file services, or application data, the cost of downtime quickly exceeds the cost of a proper spare. This PSU helps preserve that continuity by matching the original power architecture of the NAS. It is the right choice when you need a service part that aligns with the platform rather than a generic substitute. Use it as a stocked replacement in remote offices, branch deployments, or central IT spares inventory. When a power component becomes the point of failure, having the correct part on hand shortens recovery time and keeps the storage layer dependable.