Modify backup to nearline/port backup code

[max-zilla]

Port backup code to Condo.

Completion criteria TBD.

• Need to update documentation https://github.com/terraref/documentation/edit/master/data-backup.md

[craig-willis]

Moving this to the current sprint temporarily. @jdmaloney the scratch move is a higher priority. Let me know if you can't complete both in this two-week timeframe.

[max-zilla]

@jdmaloney any updates here?