Just added a script to github which takes care of duplicating the most recent duplicity backup files.
You can specify the amount of past backups runs. By default the last two full backups and their incrementals are copied, older files are automatically deleted (sliding window of most recent backups).
Use this script to add another level of redunancy in case that the main backup location fails.
The software, i.e. file naming conventions has been tested with duplicity version 0.6.13 (yes I know, quite old).
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