Norton Ghost 15 problem backing up C drive

Hello.

 

I'm using Norton Ghost on my Windows 7 ultimate PC and have been using it for quite a while with no issues.

Just recently the backup for my C drive has not been successful.

When the backup runs it advises that the recovery point is being created and the volumn data is being copied. However a  datafile is created on my NAS for 74 Gb almost immediaely but this does not grow to the 130Gb that I expect. After around 2 hours the backup stops, the datafile then disappears and Norton Ghost advises "Attention Needed".

 

I can't find any Norton logs to aid me in resolving this.

 

Can anyone advise what may be causing this.

 

Thanks very much for any advice.

 

Phil.