For these critical reasons, downloading unofficial versions, such as the "Acronis true image 2014 portable" found on file-sharing sites, is a serious risk that should be avoided.
Databases (like SQL, Exchange) and open system files (like the registry hive) are locked by the OS. Without installing a low-level filter driver (which requires a reboot or a kernel driver load), a portable tool would skip or corrupt these files. Your "portable backup" would be useless for restoration. acronis portable version
You must have the full software installed on at least one computer to generate the portable media. How to Create Bootable Media - Acronis Support Portal For these critical reasons