4 High performance NAS hard drives included optimized for continuous 24/7 operation Ideal for creative professionals 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 5/10 support and hot-swappable hard drives provide comprehensive data protection