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#11
Assuming you are using Windows Imaging and file/folder backup:
Both
1) Volume Shadow Copy
2) Microsoft Software Shadow Copy Provider
Should be set to manual as per MS advice.
and
a check for drive errors should be carried out
Disk Check
Seagate SeaTools will allow you to also run some quick diagnostics on D:. Since it is 1TB a full scan will take some hours.
SeaTools | Seagate
Also try just making an image using "Create a System Image" button.