If while backing up your files using Windows Backup in Windows 7, you are frequently unable to to so, and the backup fails and you receive the following error message:
0x81000015 : Windows Backup could not create a zip file. This could be because the drive that Windows is installed on does not have enough space or it could be a temporary error. Make sure you have at least <size> MB of free space and try again
then you may want to see and maybe uninstall some 3rd party software programs installed on your computer.
Windows Backup could not create a zip file
This problem occurs if you have one of the following third-party software programs installed on the computer:
* Carbonite backup utility
* IDrive applications
This problem is caused because of conflicts between Windows Backup and third-party software programs that are associated with .zip files. This problem may also occur if you have installed some other third-party software programs that monitor .zip files.
To work around this problem, use one of the following workarounds before you run Windows Backup:
* If you have Carbonite backup utility installed, disable the utility.
* If you have IDrive applications installed, disable the applications.
* If you have StuffIt installed, remove .zip associations from StuffIt.
* If you are running other third-party software programs that are associated with .zip file, disable the programs.
Sourced from KB981908.
UPDATE: Please also read the comment by gtempo below.