I've never had to do a restore on a Windows 7 or 8.1 machine
Here's an Amiga inspired fun-fact... The data on my current XPsp3 box began in 1994 as windows 3.1 on a 40meg harddrive (meg not gig). I have copied that data to bigger and bigger drives over the years, upgrading motherboards, upgrading windows, but never doing a clean install. 3.1>3.11>95>98SE>XP to the current XP3. My main workstation for years, the kids now use it as their main steam game box. Looks like I'm finally stopped at XP3 though as there isn't a code upgrade path to win 7. Maybe I'll see if I can go vista first to win 7.
As I upgraded hardware in my Amigas over the years it was never necessary to do clean installs to update the OS. I just copied the existing drive to a new bigger drives. My Amiga drives today started out as a copy of the 1.3 install on a 20meg HD from my A500 in 1989. I always took it as a challenge to make windows take the same route.
P.S. Amiga all at 3.9 now.
Plaz