I just upgraded the BIOS on my NUC7i5BNH running Windows 10 Pro 64-bit from BIOS BNKBL357.86A.0069.2018.0920.1250 to BIOS BNKBL357.86A.0080.2019.0725.1139. Immediately prior to this BIOS update I successfully created a System Image. Same day after the BIOS update I tried to create another System Image.
System image creation failed with this message:
"There was a failure in preparing the backup image or one of the volumes in the backup set (0x807800C5)
Additional information: The specified backup disk cannot be found (0x80780081)"
I ran system Image creation again and saw that it was trying to copy the EFI System Partition when it failed. Windows 10 Disk Management shows I have 2 (two) healthy EFI System Partitions. I'm not sure how many I had before BIOS update, but I think it was one.
Anyhow, I think the BIOS update caused the failure in System Image creation.
The BIOS update does not create EFI or system partitions, or any partitions.
What backup utility were you using? The disk imaging provided by Microsoft, or some 3rd party tool? That is who to contact.
Doc, thanks for pointing me in the right direction. I did some Google searches and found that the error was due to the presence of an EFI System Partition on the target volume that was to hold the system image.
I formatted the target volume with diskpart to eliminate its EFI partition and then successfully created a System Image.