Fix the "SqlServerWriter" has reported an error 0x800423f4 issue on SBS 2003

If you backup a Windows 2003 Small Business Server than you may have noticed that even though the backup appears to have completed successfully in the Server Manager, hidden away in the log there is this error message:

"SqlServerWriter" has reported an error 0x800423f4. The backup may continue, but the data for this component will not be backed up correctly.

After a lot of Googling I finally found the issue is the log on for the server SQL Server (SQLEXPRESS).

The user on my server was configured as .\Administrator, Change it to DOMAIN\Administrator and restart the service. All should be ok on your next backup.

LINKS
http://www.winvistatips.com/ms-sql-2005-express-broke-vss-sbs-backup-t63...
http://support.microsoft.com/Default.aspx?kbid=912414