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Why I got an incremental image file with nearly the same size as original full image?

Q: Why I got an incremental image file with nearly the same size as original full image, incremental image file should be much smaller than the original full image, right?

A: Please notice that the File incremental backup feature in our product is based on file level, it will backup all changed files since last full or incremental backup, as long as you have ever modified or edited the file, it will be included in next incremental backup. So if all the files in the image have changed, then the generated image file may be a little larger than original full image.