The best time to take a drive image is when Windows is running smoothly. Unlike Windows System Restore, which only backs up certain files and does'nt work when you really need it to, a disk image preserves an exact copy of the selected hard disk or partition
If you plan to re-install Windows from scratch, taking a disk image is good for another reason: data protection. Taking an image backup of the old setup as well as a backup of important files ensures that no files or settings are lost.
A disk image backup can also be used to replace an original Windows disc or manufacturer-supplied recovery disc.
Remember that restoring from a disk image backup will wipe all the existing files on the disk.
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