presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/backup/BackupModule.java/BackupModule/BackupModule
class BackupModule:    public BackupModule(Map<String, Module> providers)
    {
        this.providers = ImmutableMap.<String, Module>builder()
                .put("file", new FileBackupModule())
                .put("http", new HttpBackupModule())
                .putAll(providers)
                .build();
    }