Backed up File extremely small on Winclone 8

I used Winclone 7 to backup my Bootcamp (Windows) under the previous MacOS version. Since I upgraded to Catalina, I also upgraded to Winclone 8. However I noticed that the backup file xxx.winclone used to be about 70+GB for several years using Winclone 7. However, with Winclone 8, the backup file became only 630 bytes. The process took 1-2 hr so it seemed ok, but the final file is too small ! Please advise. thanks

Please control click on the image in the Finder and look at the size of the Winclone.wim or image.img.gz. This will give you an idea of the full size. The Finder sometimes does not update the size correctly.