The bootable ISO is a "rescue" tool used for critical recovery tasks when the primary operating system is unresponsive. Core Functions Product Updates - Acronis
Unlike standard backup software that runs within your host OS (Windows, macOS, or Linux), a bootable ISO is a disk image that you burn to a CD/DVD or write to a USB flash drive. Booting from this media loads a standalone Linux-based recovery environment (in Acronis’s case, a customized kernel) that bypasses the main operating system entirely. The bootable ISO is a "rescue" tool used