I just found a handy page with a Microsoft-written PowerShell script for backing up a System Center Virtual Machine Manager 2008 R2 database.
You start off by writing a script with two lines:
$VMMServer = Get-VMMServer -ComputerName "<<insert the FQDN of your VMM server here>>"
Backup-VMMServer –Path "D:\VMMBackups" -VMMServer $VMMServer
In the MS example, you save that as C:\MyScripts\BackupVMMDatabase.ps1. I’ve tweaked it so it backs up the database to the D: drive which is probably the library drive and (hopefully) has plenty of free space.
You can create a scheduled task to run the following command (one line) for VMM 2008 R2:
PowerShell.exe -PSConsoleFile "C:\Program Files\Microsoft System Center Virtual Machine Manager 2008 R2\bin\cli.psc1" -Command ".’C:\MyScripts\BackupVMMDatabase.ps1′"
Otherwise, you can do this by hand in the Administration view –> General, and clicking the Back Up Virtual Machine Manager task in the Actions pane. You can also use a traditional SQL backup of the database. And don’t forget to backup the library file share!
You will need to change the PowerShell script execution policy. You can sign the script and se the policy to AllSigned. Or you can set it to Unrestricted.