Time Capsule HDD keeps cycling on and off while my Mac is sleeping

Hi guys, I'm in a bit of a hurry so just gonna post dot points:
• My Time Capsule's HDD keeps cycling on and off continuously and potentially doing heaps of damage to it's drive when my MacBook is sleeping.
• Time Machine is set to automatically backup to my time capsule.
• As soon as I wake up and log into my MacBook it seems to stop. I checked the time capsule icon immediately and it says "Preparing backup" so I assume it was stuck in that phrase.
• I assume it backs up normally after waking up
MacBook Pro Retina:
• I usually never put my MacBook to sleep by closing the screen, so can't say if this happens when it's in closed screen sleep vs open screened sleep
• I'm not sure if there's any difference between close screen sleep and open screen sleep
• It is set to go to sleep automatically after 45mins of inactivity
• My iTunes Library is stored off-device on a 2TB HDD connected to the Time Capsule
Cheers,
Tony

How old is the TC and on what firmware?
You have put Mountain Lion for OS.. is that still the case or upgraded to Mavericks??
There has been some issues at various times with disk spinning up ..
This thread might give you some clues.
https://discussions.apple.com/thread/4148904?start=0&tstart=0
Is the computer set to power nap? Try turning that off.
Try unplugging the external drive with itunes library and see if that helps.
If it is TM the attempts to start the backup should be in the log.
See A1 pondini troubleshooting.
http://pondini.org/TM/Troubleshooting.html
Power nap.. try unplugging the laptop from power.
http://support.apple.com/kb/ht5394

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Time Capsule HDD keeps cycling on and off while my Mac is sleeping

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