This method guarantees because dd performs bit-for-bit copying, and mkisofs with explicit boot parameters ensures bootability. However, it requires deep technical knowledge.
sudo dd if=/dev/mapper/acronis_part1 of=disk_image.img bs=4M status=progress convert tib to iso extra quality
The most reliable way to get your TIB data into an ISO environment is to use the Acronis Rescue Media Builder convert tib to iso extra quality