Were there any software updates offered in the App Store for the product, or for your OS X?
• Apple - Time Capsule - Apple Support:
http://www.apple.com/support/airport/timecapsule/
System requirements for Time Capsule at Apple Store indicate:
Mac with OS X Lion v10.7.5 or later and AirPort Utility 6.3
Since the product includes AirPort and Time Capsule ideas, see both here:
http://www.apple.com/support/airport/
My gear is older, but I did look into 'ratings & reviews' here:
http://www.apple.com/shop/product/ME177/airport-time-capsule-2tb?fnode=4c
There may be some software item for the system, but it should work.
If not, after test it thoroughly, and consider a return.
Good luck & happy computing! 🙂