Team,
I would like to take database backup of the my vCenter Server.
Currently am running with the default database that comes with the vCenter during installation.
Start here: VMware KB: Backing up and restoring vCenter Server 4.x and 5.0
http://kb.vmware.com/kb/2012138 describes the manual way to do the database backup of an MSSQL express edition.
How to schedule and automate backups of SQL Server databases in SQL Server Express - this should actually give some more insight on how to automate this