Yes download Asus
Backtracker and create a USB recovery media. This will only work if you have a recovery partition to build the Recovery media with.
If you don't have a recovery partition chances are that someone Clean Installed it. It that case you'll need to locate a Win 8 IS0 or any Win 8 standard disk and download the needed driver from Asus download for you model and OS. This
thread will guide you through the set up for a clean install.
Also you can create a back up through Windows Back up. Or other aftermarket back up software.
Macrium ReflectSeems to be the best dealing with UEIF GPT Disk. Acronis claims to be compliant with UEIF GPT however I think there disk back ups will only restore partitions it can't actually restore a disk completely?
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