Normally, the Acronis Backup Management Server administrator operates on a registered machine on behalf of the Acronis Managed Machine Service (also known as the Acronis service) on that machine and has the same privileges as the service has.
Alternatively, when creating a centralized backup plan, the management server administrator has the option to explicitly specify a user account under which the centralized backup plan will run on the registered machines. In this case, the user account must exist on all the machines to which the centralized backup plan will be deployed. This is not always efficient.
To be a management server administrator, the user must be a member of the Acronis Centralized Admins group on the machine where the management server is installed.