Why is the Windows backup file larger than the original disk?

I just used the system on Windows 7 backup utility to back up to an external hard drive (USB). I'm curious to know why the backup hard disk file is 170 GB when my computer has only 103 GB used on a 150 GB C drive. Also, should it more than 8 hours to run?

When you back up your computer using backup software and that you select the default options in the backup process that you backup not only installation Windows (C:\) but also other files you can have outside of the default installation.  Also, some files may been compressed into your windows installation may have been expanded to ensure that the intergerity backup file.

Tags: Windows

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