Digitec writes 24 Mte warranty, and offers an extension to 5 years. Synology writes "5-Year Limited Warranty: At Synology, we are equally committed to innovation and quality. Synology guarantees a stable and reliable data management solution with a 5-year limited warranty and responsive technical support and hardware replacement to maximise the return on your IT investment" What exactly are the differences here? Is the extended warranty even necessary?