When installing FoE on the secondary server, you are asked to point the installation of the location where the backup image of the primary server is because its process comes with Physical-to-Physical FoE deployment. This article provides information whether it is safe to delete its contents and remove the shared directory after installing FoE.
All versions of FoE
It's safe to delete the image and remove the shared directory after installing the secondary server. However, if it's needed to restore the secondary server and the image is gone, this is critical especially with P2P FoE setup.