This article explains how to find out whether Acronis Bootable Media boots in UEFI or Legacy BIOS mode. Keep in mind that bootable media should boot in the same mode as your system to correctly perform restore or clone operation.
The mode your system boots in is shown during the initial machine boot:
In Windows 8 and 10, you can also check the boot mode using System Information:
This article instructs how to use Acronis True Image to recover Windows from a boot failure.
Use the present article only if the system is damaged to a state when you can't get to the Desktop screen and launch Acronis True Image normally. If you are able to access Acronis True Image within running Windows, please follow instructions from that article instead.
You can create a rescue bootable media - a standalone version of Acronis True Image that you can use to boot a crashed machine or a machine without any operating system and restore an image of your system. Follow these instructions to create a bootable media.
For instructions on how to create Acronis Survival Kit, see this article
How to create Acronis Bootable Rescue Media on a Windows computer