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My primary hard disk only has 617GB used. It is a 1.21TB hard drive.

I am backing up to a newly formatted 931GB drive.

I'm only doing System Backup and not any separate files.

Why is Windows 7 backup saying that I don't have enough space?

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Windows backup is not very intelligent sometimes (most times), I recommend using Easeus Todo backup free edition...todo-backup.com/products/home/free-backup-software.htm –  Moab Dec 18 '11 at 1:51

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