Backup responsibility for the unit resides at the Central Pacific Hurricane Center (CPHC) for the northeast Pacific portion of their area, while north Atlantic resposibilities are backup by the the Hydrometeorological Prediction Center (HPC).
Backup responsibility for their northeast Pacific area resides at the Central Pacific Hurricane Center (CPHC), and vice versa if CPHC were to have communication issues. North Atlantic resposibilities are backup by the the Hydrometeorological Prediction Center (HPC).