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This is a command-line option for the
This option, when specified, makes --copy-back or --move-back transfer files to non-empty directories. Note that no existing files will be overwritten. If --copy-back or --move-back has to copy a file from the backup directory which already exists in the destination directory, it will still fail with an error.
See also: Options for mariadb-backup & mariabackup in MariaDB Enterprise Server 10.6, in 10.5 ES, in 10.4 ES, in 10.3 ES, in 10.2 ES, in 10.6 CS, in 10.5 CS, in 10.4 CS, in 10.3 CS, and in 10.2 CS