OK, found some infos here: Disaster Recovery
It looks like it is working with:
[root@infra01 ~]# restore-data -b backup-data
Restore started at 2019-04-15 10:31:17
Event pre-restore-data: SUCCESS
Synchronizing remote metadata to local cache...
Copying duplicity-full-signatures.20180527T064546Z.sigtar.gz to local cache.
Copying duplicity-full.20180527T064546Z.manifest to local cache.
Last full backup date: Sun May 27 08:45:46 2018