2 High performance NAS hard drives included optimized for continuous 24/7 operation. Ideal for creative professionals and and small office users looking for a reliable external storage target. USB 3.0 offers universal connectivity for PC and Mac computers. Schedule automatic backups for your PC or office server with NovaBACKUP Buffalo Edition included. Time Machine support offers scheduled backups for protecting Mac computers. RAID 1 support and hot-swappable hard drives provide comprehensive data protection. TAA Compliant.