Backupper prof.: Boot and Backup on the same Harddisk?

Hallo,

 I have created a Win-PE Boot Harddisk (USB; WD My Passport) on a Win 10 System with Backupper prof.

Then i boot from this HD and make an Image with Aomei Backupper from my Win10 System on the same HD.

I can see the Image in Backupper under Win PE.

After them I start my Windows again and found no Image on the Harddisk!?

Is it not possible to create a Boot HD and make a Systembackup on the same HD?

Many Thanks

Reinhard