convert server core to full/minimal interface GUI

Hi,

We have a dell server running Microsoft Hyper-V Server 2012 R2 core edition and we are planning to take backup of VM's to a tape drive (Dell PowerEdge LTO-6 SAS drive). But the core edition is not detecting the tape drive and the drivers.

Can we switch to minimal server interface/Full GUI in Hyper-V server 2012 R2 ?

What is the best one and can we switch back after installing the tap drive drivers ?

Please suggest .

Thanks