After activating one or more licenses, you will need to backup the activated licenses (trusted storage).
The backup copy is needed in some situations like if the computer/server is crashed or if the activated licenses got broken or perhaps a case that you formatted the computer/server without a successful deactivation of the activated licenses.
Trusted Storage is the place where the licensing information is stored on your server computer, and it is located in:
(Windows 7 and Windows 8)
If this folder is not visible in the Windows Explorer, go to Organize > Folder and search options tab View in the Explorer. Next check the option Show hidden files, folders and drives in category Advanced settings.