The backup image file size may unexpectedly increase.
If you encounter this problem, go to [Advanced Options] in Backup Destination Storage setting to check VSS Setting.
By default, [pagefile], [hyberfile], [System Volume Information] are selected so that these files should not be included in backup source.
When these items are unchecked, these files are included in backup source and the backup file size will increase.
– ActiveImage Protector 2018