You can recover the vSphere Native Key Provider either through the vSphere Client or from the vCenter Server Appliance Backup.

When necessary, you can recover a vSphere Native Key Provider in the following ways.

  1. If you do not need to rebuild your vCenter Server Appliance, use the vSphere Client to restore the key provider. See Restore a vSphere Native Key Provider Using the vSphere Client.
  2. If you must rebuild your vCenter Server Appliance, you must restore the key provider from your vCenter Server Appliance Backup. When you perform a vCenter Server Appliance Backup, it saves the Native Key Provider. See https://blogs.vmware.com/vsphere/2018/05/vcenter-server-appliance-6-7-file-based-backup-and-restore-walkthroughs.html for information about restoring the vCenter Server Appliance from backup.