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If you are still using CentOS 7.9, it's time to convert to Alma 8 with the free centos2alma tool by Plesk or Plesk Migrator. Please let us know your experiences or concerns in this thread: CentOS2Alma discussion
I have just migrated services from PLESK 10 to 11 and I am also getting the same error. The Backups did not copy across so I set them up manually. I can FTP to the remote server from command line - so I would also be intereseted in the response to this one