When performing a backup or restore with vRanger 7.x the following error is observed:
"Error : 2760 - The supplied user credentials do not have the proper permissions to access the VMware virtual disk. Please correct the permissions or supply appropriate user credentials."
Ensure the vRanger user is VC level admin in vSphere
If user is confirmed as having correct permissions set, then another possible solution is to remove vCenter from vRanger inventory and add back in.