This backend needs at least Duplicity 0.7+. If you are still using a 0.6 variant, please see the first comment in issue #1 on how to make it compatible with the old version.
# Linux
cp amazonclouddrivebackend.py /usr/lib/python2.7/dist-packages/duplicity/backends/
# MacOS X
cp amazonclouddrivebackend.py /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/duplicity/backends
# Setup acd_cli as per yadayada’s setup guide
acd_cli init
cp ~/downloads/oauth_data ~/.cache/acd_cli
# Manually create the backup target directory, e.g.:
acd_cli mkdir --parents /backup/my_new_backup
duplicity source_path acd:///backup/my_new_backup
Same as Duplicity