You would use a sftp server to backup your vcenter, nsx-t and sddc mgr but not limited to these. In case of disaster you would redeploy the VMware product and restore from the sftp server.
1.
Deploy a centos 8 box in your environment
2.
Get into terminal
su
adduser sftp
passwd sftp
mkdir -p /opt/sftp/public
chown root:root /opt/sftp
chmod 755 /opt/sftp
chown sftp:sftp /opt/sftp/public
3.
nano /etc/ssh/sshd_config
add this to the bottom
Match User sftp
ForceCommand internal-sftp
PasswordAuthentication yes
ChrootDirectory /opt/sftp
PermitTunnel no
AllowAgentForwarding no
AllowTcpForwarding nosystem
X11Forwarding no
4.
systemctl restart sshd
Add this to your sddc manager & or nsx-t backups
-IP ADDRESS
-22
-/public
-sftp
-Add passprase