Disk imaging applications enable bare-metal restores by storing copies (images) of the entire contents of hard disks to networked or other external storage, and then writing those images to other physical disks. The disk image application itself can include an entire operating system, bootable from a live CD or network file server, which contains all the required application code to create and restore the disk images.--https://en.wikipedia.org/wiki/Bare-metal_restore
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Many excellent solutions such as Acronis and Norton Ghost already exist. However, most backup tools cost money, only save data files (rather than the whole system), or come with restrictive licenses. Many are applications that are designed to run on a specific platform. While there are some open source alternatives, these programs are often far too complex for regular users, and most require knowledge of a command line, or ask too many difficult questions.
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