Windows 8: create system image fails with 0x80070001

Last week i tried to create a system image with the built-in backup-tool from Windows 8. It sounds very easy:

• connect an usb storage to your computer
• start system image creation (look here)
  But then i got this error: 0x80070001

After googling around i found the following solution:

• http://support.microsoft.com/kb/973455

But there you get something with junctions and FAT-filesystems... This did not solve the problem...

The solution was very easy: I had truecrypt running and this created an additional mount point. After stopping truecrypt the system image was created without any error...