On this show John WD9BCH shows us how to backup a image from a allstar node or hotspot with a utility on a Mac. 

You can find the utility below.

 https://www.balena.io/etcher/

For a transcription click the dropbox link below.

https://www.dropbox.com/s/lb6qc0aj31dxqzp/Backup%20Utility%20Micro%20SD%20card%20Mac.txt?dl=0

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