Acronis True Image Echo Server for Linux - User Guide - Manual (Page 80)

You can determine the source and destination using the information provided in this
window (disk number, capacity, label, partition and file system information).
13.3.3 Selecting destination disk
After you select the source disk, you have to select the destination where the disk
information will be copied.
The previously selected source becomes grayed-out and disabled for selection.
If either disk is unpartitioned, the program will automatically recognize it as the
destination and bypass this step.
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