I have had real good luck using
Macrium Reflect you can get the free version it works for Disk/Partition Images and cloning. You only need to pay if you wan to run scheduled back ups. Some people like Acronis True image, Paragon another I've heard of.
Since you going back to win 7, you should install it in UEFI mode SP 1 supports it. Be sure to Image your entire C:\ HD/SSD to in sure you can get back to a booting Win 10 UEFI restore.
You mention Backtracker, I think your right 10 is not supported? It really wasn't reliable there were lots of issue with it. All it really did was copy the Asus Recover partition to a bootable USB thumb drive.
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