hi,
i did this job a few days ago.  i tried to use the disk management built-in 
tool to backup, but the operation is so complicated and i was confused. later, 
my friend told me that i can backup with the help of professional tools. and i 
took her idea. many backup tool can download the free edition. i used AOMEI 
Backupper,download here http://www.backup-utility.com/. it can backup the image 
to NAS, which can give a big help for restoring to many PCs.  you can google it 
or other backup software. any way, i believe with its help, things will be easy.

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