You may experience the following error if using Windows Backup on a Windows 7 machine:
Cannot write to the drive, Error Code 0x80780047
Solution:
Backup and restore will create seperate folders on the external drive for the machines being backed up. However, the system image is placed outside the folders and the rest of the backup is placed inside the folder. Backup and restore only allows for 1 system image to be stored on a drive.
When you try to backup a second machine, the backup starts to write to the correct folder. When Backup tries to save the system image, it finds that it already exists and the error mentioned above is presented.
The best option is to partition the drive for each of the PC’s, so backup job can excecute normally thus avoiding the “cannot write to the drive” errors.