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Backup smaller than showing when completed

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I have the backup set to full and it shows the backup size of 141gb.  The backup runs as scheduled and shows it is successful but the size of the completed backup is only 46.7gb.  Everything seems to be working fine but i am not sure I am getting a full backup.  I am using Acronis True Image 2017.

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Phil, welcome to these User Forums.

If you are making your full backup from within Windows with ATI 2017 then there are a number of default exclusions which can be applied when the task is actioned, these include some very large system files (pagefile, hibernation file and swap files) along with System Volume Information folders (which store system restore point data if system protection is enabled), so can account for a lot of data being excluded, plus there can be compression of up to about 20% being applied too.