QNAP Advanced Replacement Service (QARS) is an optional service to expedite hardware replacement. QNAP products are designed and manufactured with high quality components to provide excellent reliability. For additional protection, QNAP offers an advanced replacement plan for customers who want to minimize the amount of time without a QNAP unit when seeking service. With QARS in place QNAP will ship you a replacement unit in advance of you having to send QNAP your existing NAS. The advanced replacement plan is a great option for any customer seeking to minimize downtime.