Incremental backup file size suddenly increased by 30x
I have ATI 2013 with Windows 8 64 bits.
Until a few months ago all my incremental backups were about 3GB in size with the biggest ones at 13GB (after a full initial backup of 580GB).
Then suddenly they went up to 100-120GB each: a 30x increase.
I don't remember changing any setting and "Sector by Sector" is not checked.
I thought it was due to my signing up to a larger account size on Dropbox (from 2.5 GB to 100GB), so I excluded the Dropbox folder from being backed up, but that did not make any difference.
I understand defragging can bloat backup size but I was defragging in the background also before when the incremental back-up size was 3-13GB.
Does anyone have any possible explanation and/or solution so that I can go back to having smaller incremental backup file sizes?

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Hi Grover, thank you for your complete and thorough reply. I was not aware I was entitled to a free upgrade. Thanks for pointing out.
I'll try your recommended solutions and will report back.
You are a true Forum Hero!
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