First I've heard of this for a G75, maybe since I have paid for cloud back up I just didn't pay any attention. It must have been attached to your original install. If you want it back I suppose you'll need to restore to factory condition. Sort out how its connected and how you'll be able to connect to it after a fresh Install as it would have been part of the factory installed bloat ware, that you we avoiding by clean installing!
G752VY-DH72 Win 10 Pro
512 GB M.2 Samsung 960 Pro
1 TB Samsung 850 pro 2.5 format
980m GTX 4 GB
32GB DDR 4 Standard RAM
Z97 PRO WiFi I7 4790K
Windows 10 Pro
Z97 -A
Windows 10 Pro