Portions of a file are not backed up.
Platí pro: Windows SBS 2003
Cause: The destination of the backup has previous versions (Volume Shadow Copy Services) enabled on it, and the allocated space for previous versions does not have enough room for the entire backup file.
Solution: Either disable previous versions (Volume Shadow Copy Services) by using the Backup Configuration Wizard or choose another destination for the backup.
Backing up to a volume on which previous versions are enabled will drastically reduce the number of previous versions from which users can restore.