Acronis True Image Mac fail

It appears that when using Acronis True Image 2015 to backup a MAC to a NAS, it creates a file that will be overwritten by another MAC doing exactly the same.
Why?
Because Aronis does not let you name the backup file in a unique way or even better, uses the machine name as the filename for the backup target.
This means, if you want to use the product, you have to create several folders, one for each machine. The more MACs you want to backup, the more folders you need.

This is a complete product design fail!