Bootable media on a Macintosh - only to backup and restore USB drives - not the Mac drive

I understand Acronis does not support Macintosh . . but what about when you are using the Acronis Boot CD to backup and restore a drive attached by USB to the Mac ? . . never touching the Mac hard drive. In this scenario the backup file is on USB and the drive being backed up or restored is attached with USB.

Why do we need this ? We distribute disk images for restoring the hard drive in Automobile Navigation systems. We need PC and Mac users to be able to restore the Disk-Image to the Naviation Hard drive attached to PC or Mac with a USB adaptor. ( we have been using Clonezilla for this because it works with PC and Mac, but there is a specific Navigation system that Clonezilla can't do even with DD sector copying because Clonezilla has some sort of error correction that causes the cloned drive to not work in the Nav system ) Acronis works for restoring this Nav system hard drive, but we want to continue supporting Mac owners.