Introduce process of generating vCenter backup file step by step.
It is required to have a backup server supporting one of these protocols: FTPS, HTTPS, SFTP,FTP,NFS,SMB or HTTP. It's also available to use sftp://<host-ip-address>/vmfs/volume/<Datastore>/<Folder> when SSH is enabled on the host.
VMware vCenter Server 8.0
Make sure in backup server there's no folder named vCenter at backup location.