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Operations Manager 2007 Backup and Recover Guide.
Root Management Server
The Root Management Server is the central point of configuration management and overall health monitoring of the entire managed environment. This is the first Management Server installed for a Management Group. The most important component of the Root Management Server that must be backed up is the Root Management Server encryption key, which holds all the Run As Account information defined in the Management Group.
Note: Without a backup of this key, you would need to re-enter your entire Run As Accounts if you need to rebuild the Root Management Server.