SharePoint Sites go into read-only when SQL Server Backup is running

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http://serverfault.com – I have SharePoint 2007. When the database backups run using SQLCMD SharePoint sites go into read-only. Users can't add anything to the sites the buttons are grayed out. On the backend the databases do not get set to read-only. My question is this, is this normal with SharePoint? I have read some forums that say SharePoint does this by default but the information is a little murky. Thanks Bryan (HowTos)