Time Capsule is backing up like its the first time - every time.

I have 60+ gigs to backup. It takes a full two days for the first backup. No problem. The problem is that after the initial backup, it should only check and 'update' new material and add to the backup. I understand this just takes a few moments.
My Time Capsule doesn't do this. It begins backing up the entire 60+ gigs again - which takes 2 full days.
I can't find a setting anywhere to adjust this and find nothing in the manual.
Anybody?

Some of it.. is the difference between digital bytes and binary bytes.
You are contrasting the Apple bytes and Orange bytes and worrying why they don't match up.. they will never match up. They are not the same.
If you did not realise it, apple changed the way TM reads the disks to digital bytes.. so a 2TB drive does not format to 1.8TB which is the correct size in binary bytes. (real bytes) 
Your HD info on the other hand is actually measuring binary bytes.
If you did not realise..
Here is v5.6 airport utility
Here is v6 airport utility looking at the same drive.
And Time Machine.
How does one version of the utility see the disk as 2TB and the other as 1.8TB.. simple.. one is real bytes and the other is the hard disk manufacturers way of making disks look bigger than they are.. ie digital bytes.
So nowadays I just ignore everything the Mac tells you about file sizes because none of it is now believable. What is truth? When you stop having standards then truth is in the eye of the advertising man and you always get the biggest number for specs and lowest number for price.. and neither are true.
if you are using digital bytes or binary bytes.. so think of it as your maths teacher taught you.. 6 apples does not equal 6 oranges.  And when you throw away the standard who knows what you are counting.
Check Pondini for info about what size a backup really is.
http://pondini.org/TM/D4.html

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