Microsoft's Volume Shadow Copy (VSS) is a service that creates and maintains snapshots, shadow copies, of disk volumes in Windows. CTERA uses VSS when taking a snapshot. You can change the VSS location to be under the C: drive.
Step-by-step guide
Right click the C: drive and select Configure Shadow Copies…:
The Shadow Copies window is displayed.Select the EFI partition, which is often displayed as \\?\Vol... and click Settings...:
The Settings window is displayed.In the Storage area section, select C:\ in the Located on this volume drop-down as the destination for the shadow copies location for the EFI partition and No Limit for the Maximum size option:
Click OK in the Settings window and in the Shadow Copies window.
The EFI location is defined in the C: drive.