Acronis Backup for Windows Server Essentials - User Guide - Manual (Page 149)

149 Copyright © Acronis International GmbH, 2002-2014
system
BIOS
Disk: MBR
BIOS
Disk: GPT
UEFI
Disk: MBR
UEFI
Disk: GPT
BIOS
OS:
convertible
Solution
Recover the operating
system to an MBR disk
or to an uninitialized
disk.
The target machine
must support BIOS.
Additional steps
1. Before recovery,
turn off the UEFI
mode in BIOS
2. Perform the
recovery under the
bootable media.
or
After recovery, turn off
the UEFI mode in BIOS.
The convertible OS
will be automatically
converted to support
UEFI booting.
BIOS
OS: non-
convertible
Solution
Recover the
operating system to
an MBR disk or to an
uninitialized disk.
UEFI
OS:
convertible
The convertible OS
will be automatically
converted to support
BIOS booting.
The target machine
must support UEFI.
Additional steps
1. Before recovery,
turn on the UEFI
mode in BIOS.
2. Perform the
recovery under the
bootable media.
or
After recovery, turn on
the UEFI mode in BIOS.
Solution
Recover the operating
system to a GPT disk or
to an uninitialized disk.
UEFI
OS: non-
convertible
Solution
Recover the operating
system to a GPT disk
or to an uninitialized
disk.
5.2.2 Recovering disks
Let's assume you backed up a whole disk (with all its volumes) and want to recover this disk to a
different target platform.
The ability of the recovered system to boot up in different modes depends on the operating systems
installed on the source disk. Operating systems can be convertible i.e. allow changing the boot mode
from BIOS to UEFI and back, or non-convertible. For the list of convertible operating systems, see
Recovering volumes (p. 148).

When a source disk contains one or more operating systems and all of them are convertible, the
boot mode can be automatically changed. Depending on the current boot mode, the target disk
may be initialized either to GPT or to MBR partitioning style.

If at least one operating system on a source disk is non-convertible (or the source disk contains
any boot volumes of the non-convertible OSes), the boot mode cannot be changed automatically
and the software will initialize the target disk as the source one. To boot up the target machine,
you have to turn on/off the UEFI mode in BIOS manually. Otherwise, the system will not boot
after recovery.
The following table summarizes all cases of recovering disks of a BIOS-based system to UEFI-based
and vice versa.