Time machine back up failing after itunes update

I am having a massive problem with my Time Machine back up.
My set up is as follows
late 2011 Macbook Pro 13" running latest version of Yosemite
An older Airport Extreme running version 6. something (latest version)
Macbook connected via WiFi on the 5Ghz
Connected via USB to the Airport Extreme is a Western Digital 2TB hard Drive.
My last successful back was 5.40pm on 1st February 2015. The only changes to the system that have been done since that time is an updated to the latest iTunes version.
This is what is happening.
Time machine shows the disc as connected and that there is 905GB of 2TB avaialble.
When the back up starts it finds the disk, prepares the back up and than starts.
It states the back up is about 29GB in size (so more than enough room on the hard drive).
The back up begins and after about 10 minutes (or somewhere around 4 or 5 GB) the back up fails and a pop up window in top right hand corner comes up saying that the back up has failed as there is not enough room on the Time Machine Backup (that is what I have called the drive).
I have run it a number of times and always the same thing.
I have run a disk utility check on the hard drive and run a repair disk and veriofy disk and both stated that there drive was fine with no problems.
I have powered down the entire network, shut the computer down and rebooted the whole thing but still the same problem.
I can't think of anything else I can do. Any suggestions from anyone greatly appreciated.

Problem solved. Can't remember what I did though!

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I then tried to move it (TM back up files) off with Restore, whilst preserving the TM back ups but I couldn't seem to do it to the i-Macs hard drive nor to partition that to allow this to happen (assuming the lack of a discrete partition was the problem).
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Not sure I explained myself clearly. Sorry. Having understood from your earlier help that 'migrate' actually means 'make a copy in another place', I have the migrated account in two places: one now dormant, on the old i-Mac and two, where it is migrated to (the new i-Mac). But TM continues to back up all accounts, indeed everything, on the old i-Mac by dint of its MAC address. So to see the migrated account's past history I assume I have to access the version on the old i-Mac. To put it another way, when logged into one account on the old i-Mac I believe it is not possible to see the TM history and files of another account on that i-Mac despite TM backing the entire HD. You have to be logged in to that account to see it. On the new i-Mac, with its different MAC address, TM is busy creating the first TM back up and I assumed that in the migrate it did not bring TM history as I had read that it is MAC address specific.
The only issue (apart from having this account's history spread over two machines (pre-today on the old i-Mac's TM and today onwards on the new i-Mac) is that I have all the files on both machines. I am not worried about security only unnecessary usage of disk space. It isn't critical, there's lots of it, but it just seems wasteful and untidy. Unless you guys know otherwise?
If I understand what you've done, you do have duplicates of the current contents, but only one copy of the old backups (on the old F/W drive).
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Not sure I understand this. What would have been nice but I do not think is possible is to have moved the account to the new i-Mac together with the TM's back ups of that account and continue to build it up (whilst having access to its history) on the new i-Mac. If that were (is?) possible I could have totally deleted the old account and with it its files from the old i-Mac, freed up some HD space and had a full AND growing TM history all on the new i-Mac.
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