Hi Sujadi,
Hopefully, you have a full backup of the Appeon folder and its sub-folders that contain the key product information. Restoring those files from your back-ups should be all you need. This will include the critical "Appeon.License" file to get your Appeon Web 2013 back up and running again.
The only caveat to this restore option would be if your also having to replace the host Application Server and/or its machine as the Appeon.License file would be tied to your PC / VM. If that is the case, yes - you would need to perform a full install again and then you would need a new Appeon.License file to fully enable the Appeon Web instance.
Regards ... Chris