Backing up the unsealed MP’s and the overrides in SCOM is one of the most important task that have to be done regularly. SatyaVel from SCOM team provide us with such PowerShell script. Download it from the link below.

http://blogs.technet.com/b/momteam/archive/2012/04/16/powershell-script-to-backup-opsmgr-overrides-and-unsealed-management-packs.aspx