Comment 25 for bug 1278529

#18 helped me debug the issue.

This gave me the error: S3ResponseError: S3ResponseError: 404 Not Found

The default behavior used to be that duplicity would create a bucket if it didn't exist. This doesn't seem to be the case anymore even when using us-east region.

I also had to use the following connection string format: s3://s3-eu-west-1.amazonaws.com/bucketname/

For a list of regions and end points for S3 see: http://docs.aws.amazon.com/general/latest/gr/rande.html#s3_region