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Why is first incremental files and folders backup nearly as big as first entirepc backup

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I've just installed ATI 2015. I did an "entire PC" backup on Feb. 14. I backed up to a USB external drive plugged into a rear USB port on my HP desktop, running Windows 7 Home Premium. I'm using Firefox to talk here.

ATI shows that the "entire PC" backup file on the USB drive is about 56.5 GB. Windows shows the same file on the USB drive at around 82.356 GB. Big file!

I just launched my first "files and folders" backup moments ago, Feb. 20. I made it incremental. ATI predicted it would be around 79.2 GB! That's bigger than the 56.5 GB it created when it did the "entire PC" backup!

When it finished, it said it had processed around 50 or 51 GB, and produced a file of about 37.39 GB on the USB drive. Windows reports that file is about 39.6 GB.

My concern is, that in between doing the "entire PC" backup on Feb. 14 and doing the first incremental files and folders only backup this afternoon, all my wife and I did is read email, use Microsoft Excel or Windows, and I used my financial portfolio monitoring software. We don't download music. We don't play games. I did no software updates or hard drive maintenance of any kind.

It's very hard for me to understand why the first incremental files and folders backup would be anywhere near the size of the first entire PC backup!

Does this make sense to any of you who know how the ATI program works?

I want to be sure, having paid cash money for the program, that I can trust the backups it's preparing for me!

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