private function registerCompressorProvider() {
        $this->app->bind(\BackupManager\Compressors\CompressorProvider::class, function () {
            $provider = new Compressors\CompressorProvider;
            $provider->add(new Compressors\GzipCompressor);
            $provider->add(new Compressors\NullCompressor);
            return $provider;
        });
    }