https://qa-reports.gentoo.org/output/gentoo-ci/output.verbose.html;pkg=app-backup:duplicity says: > DuplicateFiles duplicate identical files in FILESDIR: 'files/duplicity-0.8.17-fix-docs-cmd.patch', 'files/duplicity-0.8.18-fix-docs-cmd.patch Please drop one of the patches if they're identical. It's okay to refer to older patches in newer ebuilds. I usually keep the one with the older version in the name to show which version it was based on.
Looks like all affected versions are no longer present in the tree.