Currently, the protocol describes on the documentation is NFS. This protocol is not secure enough for some customers, so they want to use the SFTP protocol instead. To be able to use the SFTP protocol, the package lftp is required, this package needs to be installed by the ReaR installer.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Red Hat OpenStack Platform 16.1.3 bug fix and enhancement advisory), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHEA-2020:5413