#EXOS 30.7 or Older
show memorycard
ls /usr/local/ext
download image memorycard <image>.xos

#EXOS 31.1 or Newer
show switch mounts
ls /usr/local/ext
download url file:///usr/local/ext/<image>.xos

Solution: Downloading image failed with – write error: No space left on device | Extreme Portal (force.com)