presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/backup/BackupConfig.java/BackupConfig/setProvider
class BackupConfig:    @Config("backup.provider")
    @ConfigDescription("Backup provider to use (supported types: file)")
    public BackupConfig setProvider(String provider)
    {
        this.provider = provider;
        return this;
    }