These values are high.

DAVG/cmd, KAVG/cmd, and GAVG/cmd should not exceed more than 10 milliseconds (ms) for sustained periods of time. If these values are constant I would check the contention latency from the storage side.

As the backup runs, I would also check the read values on the storage side and validate if the high reads are causing a spike.

Also, please check the HBA latency.  The screenshot looks to be individual LUNs.

Press d to switch to disk view (HBA mode)