Limitation

• All hardware must be on the Red Hat compatibility list
• The server must have at least two storage volumes
• A separate volume for the operating system (minimum 100GB).
• At least one additional volume for data. All additional data volumes must be larger than the operating system volume.
  https://helpcenter.veeam.com/docs/backup/vsphere/hardened_iso_requirements.html?ver=120

Download: https://www.veeam.com/download_add_packs/vmware-esx-backup/hardened-repository/