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Is it really possible to create a backup of Win8.1?

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I was looking at an article stating, " You CANNOT make a sector-by-sector copy of GPT disks. The Disk and Partition GUIDs will no longer be unique. This must never happen. You can make a sector-by-sector copy of the contents of ESP or basic data partitions." That was from a Microsoft site by the way. So after reading that I'm really kinda confused on what to do here. Is it possible to make a full backup? I just want a exact clone of my fresh install of Windows 8.1 so I can store it somewhere else in case of a disaster. Then secure erase my messed up drive and use my backup to get me to where I was before. But after reading that I'm confused.

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Yes it is possible. I have done multiple backup and restores of a full disk UEFI/GPT Windows 8.1 64bit.

I guess it does say that "You can make a sector-by-sector copy of the contents of ESP or basic data partitions" I guess they have the program set up to do that automatically so we dont mess up that unique whatever it is. GUID?

I have done multiple images and restores of UEFI/GPT Win 8.1 disks too. And while I get disconcerting error messages from ATIH2014 during and at the end of the recovery process, it all works just fine.

The cloning operation does handle GPT disk as well.