Acronis Backup for Windows Server - User Guide - Manual (Page 117)

117 Copyright © Acronis International GmbH, 2002-2014
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. 115).

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.

Green background means that the system will be bootable. No user action is required.

Yellow background means that you need to perform additional steps to make the system
bootable. These steps are not possible on some machines.
Original
system Target hardware
BIOS UEFI
BIOS
OS:
convertible
The target disk will be initialized as GPT.
The OS will be automatically converted to support
UEFI booting.
If you want to recover the source disk “as is”:
1. Turn off the UEFI mode in BIOS.
2. Boot from a bootable media, and perform the
recovery.
BIOS
OS: non-
convertible
The target disk will be initialized as the source one
(MBR).
The target machine must support BIOS.
Additional steps
1. Turn off the UEFI mode in BIOS.
2. Boot from a bootable media, and perform the
recovery.
UEFI
OS:
convertible
The target disk will be initialized as MBR.
The OS will be automatically converted to
support BIOS booting.
If you want to recover the source disk “as
is”:
1. Turn on the UEFI mode in BIOS.
2. Boot from a bootable media, and
perform the recovery.