Time Machine prepares back ups of 10GB and more with very little activity on my computer

I have an early 2008 iMac with a Samsung 750GBHD, and I am using a Time Machine since 4 years ago working pretty well.
As of beginning 2014 it started to show many errors but at the end of the day there were 1 or 2 back ups done. During this August I realized that back ups were of a size of 10Gb and more nearly every day while the activity of the computer was very light, internet and mail. I cut an anti virus that was working on the background with no success. There is no virus activity, the comp is clean.
What could be the reason for this abnormal activity?

Only way to find out is to analyse what is actually causing the large backups.
Have you installed the widget yet??
A1 here.
http://pondini.org/TM/Troubleshooting.html
Or you can get a software app that tells you what TM is doing since it is hardly forthcoming.
See A2
For why backups are over large.. generally.. see D4

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