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Backup Size Mismatch.

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Hey everyone,

I backed up my hard drive to an external hdd using Acronis 2010 at the size of 170gb. However, my backup size is only 142gb. I am new to backing up, can anyone explain why the size of the backup is different than the original size of my hard drive.

I tried backing up with Acronis 2013 and there is still a size mismatch, am I missing something here?

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Is it just my settings for compression size? I set it to normal could this have resulted in a difference of 28gb?

yes, the type of files will cause variance but a normal compression will cause the backup file to be about 20-30% smaller in size due to compression.