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Rename the command to reflect that it is a low-level backup, since
we are introducing a higher-level backup mechanism in the framework.
Also change the syntax a little to make it less dangerous -- you
now must explicitly specify a backup or restore, and if you don't
do so it will abort with its help message.

AI 143417: am: CL 143416 Quick and dirty backup command.  This should only be included in dev builds.
  Original author: hackbod
  Merged from: //branches/cupcake/...

Automated import of CL 143417