Duplicity doesn't follow symbolic links (that's the way it is). To backup a directory, one must use the absolute real path in configuration file.
As long as Duplicity doesn't provide a solution (cf. https://bugs.launchpad.net/duplicity/+bug/721599), it is be possible for the script to accept symbolic links in configuration file and expand them to realpath at runtime. That would be useful in some cases.
Duplicity doesn't follow symbolic links (that's the way it is). To backup a directory, one must use the absolute real path in configuration file.
As long as Duplicity doesn't provide a solution (cf. https://bugs.launchpad.net/duplicity/+bug/721599), it is be possible for the script to accept symbolic links in configuration file and expand them to realpath at runtime. That would be useful in some cases.