Paul Isaacs said:
What's the difference between backing up a drive and imaging it in
terms of what is actually copied to the backup or image location?
Also possible is to image partitions, on the same or a different
drive. One difference in that case is the ability to restore the
Windows partition when all goes bad. It doesn't (or shouldn't) take
as long and requires less space.
It depends on the software you're talking about, but an image can
allow you to recover functionality and not just data.