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Disc Image backup much larger than disc content

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I have been imaging my entire hard using Acronis 2015, booting from an Acronis generated boot disc. Everything was going fine (image size on external USB 3.0 drive around 65GB) until about a week ago when image sizes were coming out to be 770GB (larger than my hard drive). I thougt Acronis only imaged content but it appears that it is imaging the entire hard drive including blank space. Between the smaller and larger backup I have only installed Office 2010. I am doing everything else the same. Any ideas why the change?

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Did you turn on bitlocker?
If not, run chkdsk X: /R on each partition of your disk. I suspect it could be an issue with the file system.
If no issue on the disk, uninstall, reboot and reinstall ATI. Start new backup tasks pointing at empty directories