When you finish this wizard, the selected disk(s) will be reformatted and all the existing volumes and data on the disk(s) ...

When you finish this wizard, the selected disk(s) will be reformatted and all the existing volumes and data on the disk(s) will be deleted. To enable users to move backups offsite for disaster protection and to ensure backup integrity, the entire disk(s) will be dedicated for storing the backups and will not be visible in Windows Explorer.  Click Yes to use the selected disk(s).