I had a stab to backup my System Image with Macrium Reflect (Win 8.1 Macr.Reflect IMAGE 25.7.15) & created the files shown in first scan below.

Also in Reflect created a Rescue Media MACRIUM REF(I) USB stick shown in second scan.

I tried to boot my spare 500gb with the USB stick (first boot disk in BIOS) but failed to update to w8.1.

What could I have done wrong?