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From: "Jason Pyeron" <jpyeron AT pdinc DOT us>
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Subject: RE: [cygwin] Re: Is a disk image created within dd "safe"?
Date: Wed, 2 Sep 2015 18:23:18 -0400
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> -----Original Message-----
> From: Eric Blake
> Sent: Wednesday, September 02, 2015 6:06 PM
> 
> On 09/02/2015 03:57 PM, Clint Olsen wrote:
> 
> > I'm also interested in generating images to preserve the 
> entire disk.
> > What I'm wondering is whether doing this on a live system through 
> > Cygwin would produce a safe, bootable disk image or if the the APIs 
> > that Cygwin has to use or having the disk mounted would make this 
> > unreliable?
<snip> don't do it with out snapshots... </snip>
> There are various solutions that CAN capture an accurate 
> point-in-time disk snapshot.  

For cygwin/Windows use the Volume Shadow Service (VSS). I have used (XP)
cygwin dd and rsync to take (clone) images from the VSS managed drive.

-Jason

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