I have the exact same problem. We are running Plesk Onyx v17.0.17_build1700161028.14 os_CentOS 6 (6.8).
The backup file is 25.7 GB and we got These error!
Unable to import file as dump: pmm-ras failed (Error code = 1): STDOUT: Transport error: 0 byes were read but 18446744052211620616 expected...