For locally-attached Image backup definitions, please consider adding the ability to specify the Disk Label of the destination drive instead of the Drive Letter.
This would allow the destination drive to be moved to another port (where Windows will assign a different drive letter) without having to change the Macrium definition.
Windows persists drive letters based on unique Disk ID and partition offsets. This doesn't change when you move a drive to a different USB port or any other connection.
If you are having problems with this then you may have inadvertently assigned the same drive letter to multiple drives. Windows will assign the next available drive letter if the drive letter is already assigned. To overcome this use the Windows Disk Management Console to allocate your desired drive letters with all of your drives attached. These should then remain intact regardless of USB port or sequence of attaching drives.
Thank you for the explanation Nick. I did not understand how Windows assigned drive letters. Have always thought it was by disk label. I was replacing an old drive, so renamed it to xxxOld, plugged in the new drive, renamed it to xxx and copied xxxOld to xxx.
When the next image b/u went to xxxOld, I was surprised. Now, I understand why it did that.