[PAR] [TLE] AirPort Time Capsule [SEP] The AirPort Time Capsule (previously known as just Time Capsule) is a wireless router sold by Apple Inc., featuring network-attached storage (NAS) and a residential gateway router, and is one of Apple's AirPort products.  They are, essentially, versions of the AirPort Extreme with an internal hard drive.  Apple describes it as a "Backup Appliance", designed to work in tandem with the Time Machine backup software utility introduced in Mac OS X 10.5. [PAR] [TLE] AirPort Extreme [SEP] The AirPort Extreme is a residential gateway product from Apple Inc. combining the functions of a router, network switch, wireless access point and NAS as well as varied other functions, and one of Apple's AirPort products.  The latest model, the 6th generation, supports 802.11ac networking in addition to older standards.  Versions of the same system with a built-in network-accessible hard drive are known as the AirPort Time Capsule.
[PAR] [TLE] AirPort Time Capsule [ SEP ] The AirPort Time Capsule ( previously known as just Time Capsule ) is a wireless router sold by Apple Inc. , featuring network - attached storage ( NAS ) and a residential gateway router , and is one of Apple 's AirPort products . They are , essentially , versions of the AirPort Extreme with an internal hard drive . Apple describes it as a " Backup Appliance " , designed to work in tandem with the Time Machine backup software utility introduced in Mac OS X 10.5 . [PAR] [TLE] AirPort Extreme [ SEP ] The AirPort Extreme is a residential gateway product from Apple Inc. combining the functions of a router , network switch , wireless access point and NAS as well as varied other functions , and one of Apple 's AirPort products . The latest model , the 6th generation , supports 802.11ac networking in addition to older standards . Versions of the same system with a built - in network - accessible hard drive are known as the AirPort Time Capsule .
What additional feature does the AirPort Time Capsule have over the Airport Extreme in the Apple network product line-up?
What additional feature does the AirPort Time Capsule have over the Airport Extreme in the Apple network product line - up ?
an internal hard drive
an internal hard drive