Restoring
Use the Central Administration site to restore from backups made manually. Use the stsadm utility to restore from scheduled backups. You can't use the Central Administration site to restore from a stsadm backup.
If restoring after a catastrophic failure, you will need to perform these tasks before restoring:
Restore the configuration database from SQL Server. Backup saves the configuration database, but it must be restored from SQL Server.
Reinstall custom solutions.
Rebuild alternate access mappings (if any).
Recreate the IIS metabase.
To restore from the Central Administration site:
Click Operations and then click "Restore from backup" under the Backup and Restore heading.
Select the location where the manual backups were stored and click OK. This should be the folder containing the spbrtoc.xml file.
Select the backup to restore and click Continue Restore Process on the toolbar. SharePoint displays a list of the items that you can restore from the backup.
Select the items to restore and click Continue Restore Process. SharePoint displays a set of restore options.
Select "New configuration" to create a new database or "Same configuration" to overwrite the existing database. Click OK to begin restoring.
To restore from a scheduled backup, use the stsadm command. For example, the following command line performs a full restore from a folder in backups:
stsadm -o restore -directory \\wombat0\spbackups\spbr0003 -restoremethod overwrite
To restore a single site collection, use a command ...