What I am doing presently (well just figured it out today) is taking a LUN snapshot, then copying (for now) the snapshot file to the USB drive.
Copy done presently by SSH in and then doing the copy. Next attempt would possibly be scheduling the snapshot and then using a custom scheduled task to just copy the snapshot file to the USB. Robocopy if I get the options correct.
What would really be ideal is the option to add a line or command to scheduled snapshot job entry.

