@limb, thanks for preparing the update so fast. It does not trigger a deprecation warning with the updated duplicity anymore. Unfortunately, I experienced issue https://sourceforge.net/p/ftplicity/bugs/85/ where 0.10 changed the way credentials need to be provided to the backend.
With the current stable duply, one can do:
TARGET='s3+http://bucket-name/path/' TARGET_USER='ABCD' TARGET_PASS='EfGh'
With 0.11, this triggers an error:
InvalidUriError: Invalid bucket name in URI "s3://ABCD@bucket-name/path/". One has to do this in the
TARGET='s3+http://bucket-name/path/' export AWS_ACCESS_KEY_ID='ABCD' export AWS_SECRET_ACCESS_KEY='EfGh'
Note that the exported variable names are target-backend-dependent (for Google Cloud, for example, one has to use GS_ACCESS_KEY_ID etc).