I have found over the years, that any and all Microsoft built-in backup programs going all the way back to Win95 are pretty much unreliable in terms of commercial usage. I my repair business, I use other programs to do this, along with a mind-numbingly complicated process of manual copying via Windows Explorer. If you wish to do a FULL DRIVE IMAGE BACKUP, there are other tools which work pretty good, but, yet are still not 100%. The 2 best out there, IMO, are Macrium Reflect, and Acronis TrueImage. I've used both with the Vista system I still use (and am writing this post on). And they are both free; they have paid versions, which I haven't tried due to costs; but colleagues tell me they are also tops.
Lastly, it's a good...