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Acronis recovery media - I'm confused by terminology.

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I have 3 computers with UEFI firmware.  Each computer has Windows 10 installed on NTFS MBR-partitioned drives.

Acronis documentation on creating recovery media and Microsoft documentation on creating bootable media used terms like "UEFI computer" and "supports UEFI".   I have no idea if those terms apply to me.  I also have no idea how the format of a bootable recovery medium relates to the format of a bootable drive being recovered.

When I use the Acronis Rescue Media Builder or the MVP Custom Win/PE Builder to create a Win/RE or WinPE system on a USB flash memory drive what kind of device has I created?  MBR,  GPT, or something else?  I vaguely remember a BIOS boot menu displaying the device as both legacy and UEFI.  Does it matter which boot technique I use?  

On a practical level, if I create full backup, attempt change the C drive from MBR to GPT partitioned devices, and something goes wrong, what kind of recovery options do I have?  Do I have to reformat the drive back to MBR partitions or can I recover to a GTP-partitioned drive from a backup of the MBR-partitioned drive?

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Patrick, the Acronis Rescue Media is capable of being booted in either Legacy/CSM or UEFI mode but the choice should match how your Windows OS is booted, which can be determined by checking what BIOS mode is shown when running the msinfo32 program.

As you have indicated, you can have an UEFI capable computer which boots in Legacy mode and uses MBR partitioning for the OS disk drive.  Your computer is also capable of booting in UEFI mode but which would then want your OS drive to be using GPT partitioning mode.

Older computers such as my Dell Inspiron laptop do not support UEFI therefore the choice is restricted to Legacy and MBR only.

There are consequences of booting the Acronis Rescue Media in these two different BIOS boot modes and then doing either a Restore/Recovery or Clone operation, as this will try to convert the restored or cloned image to match the requirements of the mode used.

See forum topic: Restoring from TI backup fails after Windows 10 update (1803) where I have been discussing these consequences with another user today.

Thank you, Steve.  That clarified a lot.

I, too, had an old PC with no UEFI support.  Since it was my test PC I kept my other two computers using legacy boot.  But that old PC was so different from my others that I finally replaced the motherboard (plus CPU and RAM) with something more modern.  Now all my computers have UEFI support so I no longer have an excuse to ignore it.  I'm scrambling to learn about it.