When you perform a backup with guest quiescing on the backup job fails with Error Message: "The VM has no disks".
When vRanger performs a backup of a Windows 2008 or newer VM vRanger changes the disk.enableuuid of the VM to true when the backup is ran and leaves the disk.enableuuid set to true. But when this error occurs even though vRanger changed this value VMware has not completed the configuration change that vRanger performed.
After a vRanger backup is attempted please reboot the VM that you are trying to backup, once the VM reboots VMware will complete the disk.enableuuid being set to true. After try a guest quiesced backup once again and this time the backup should work correctly.
If you want to make this change on your own outside of vRanger please use the following VMware KB , http://kb.vmware.com/kb/1028881