Rsync the Drupal tree to/from another server using ssh.
Rsync Drupal root from Drush alias dev to the alias stage. Either or both may be remote.
Rsync all files in the current directory to the 'img' directory in the file storage folder on the Drush alias stage.
Simulate Rsync Drupal root from the Drush alias dev to the alias stage (one of which must be local), excluding all files that match the filter '.sql' and delete all files on the destination that are no longer on the source.
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