This is a duplicity backend for the cloud storage service OpenDrive.
# Linux
cp opendrivebackend.py /usr/lib/python2.7/dist-packages/duplicity/backends/
# or
cp opendrivebackend.py /usr/local/lib/python2.7/dist-packages/duplicity/backends/
# Mac OS X
cp opendrivebackend.py /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/duplicity/backends
duplicity source_path opendrive://email@addr.tld:password@opendrive.com/directoryid
If you get this error and the backend script has been copied to the correct directory this means that a python module is missing. Try to install python-pip and run the following commands:
pip install requests