In releases after version 3.2.2120.1 of Alert Manager 2010, there is a known issue that throws an error when attempting to use the built-in "Backup and Restore" functionality within Central Administration. After clicking on "Perform a backup," the user receives the following:
"Multiple custom attributes of the same type found"
There is no known resolution date and no workaround for the issue at this time.
** PLEASE NOTE - Our Known Issues are numbered by the support ticket that led to the creation of the forum post and are not cumulative in regards to total issues for a specific product **