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#11
Not necessarily. An image is a file like any other and can be corrupted for a variety of reasons. I have seen several occasions where people could not restore with images made with Windows imaging. For those cases I made this tutorial which has saved the bacon of several people.As long as you are sure you have a image of the system backed up then you should be able to restore just fine i believe
As an additional safety I recommend to keep several images - grandfather, father, child at least. The you have more options.