Differential backup of disk image?

I did the disk image with Paragon Drive Backup from the USB stick.
Then I booted in Windows XP and verified image with Paragon Drive Backup 9.0 Personal OK.

In the next step I start up Differential Backup Wizard and it shows in the Archive Content my disk image. When I click Next it shows error message: The Wizard did not find any objects that can be used to make a differential backup.

Is it impossible to make differential backup of disk image or I do something wrong?

 

It seems not to recognize the original ( base) archive as relating to the same partition you are trying to make a differential of.

Have you changed the partitions in any way?

 

Like SIW2 mentioned, Paragon's not recognizing the current disk and the archive as compatible images. Couple of things might've cause this: the partition tables were changed or your disks are encrypted.

 

Well, I didn't changed the partition, but I wonder if we talk the same thing.
I made the image of the disc with only one partition on it.
It is the disk with Windows XP on it so I did the image from the recovery USB memory.
I tried to do differential backup after I booted from the disk I did the image of. I started Disk Backup v.9 from the very same disc.

Should it be possible?