QuickBooks Desktop uses different types of files to store different types of data. For example, your main company files (QBW) and backup data files (QBB) are totally different file types.
QuickBooks File Extension in Different forms
This error is caused when the QuickBooksdatabase manager software is monitoring a drive that is storing the localbackup data. The QuickBooks database manager is overwriting the files generatedby the backup with its own data for *.QBW.ND files, which confuses the backupengine. *.QBW.ND files are QuickBooks network descriptor files. These aretemporary files that do not need to be backed up (the QuickBooks databasemanager software regenerates these files automatically).
