Acronis Secure Zone Size
Enter the Acronis Secure Zone size or drag the slider to select any size between the minimum and the maximum ones. The minimum size is approximately 50MB, depending on the geometry of the hard disk. The maximum size is equal to the disk’s unallocated space plus the total free space on all the volumes you have selected in the previous step.
If you have to take space from the boot or the system volume, please bear the following in mind: