With FTP you can download the file and even much bigger ones. Through a web server --> web browser, downloading huge files is limited for various reasons and not recommended. Instead, best practice is to use an FTP client. There are many out there, including very popular ones like Filezilla for example, that make it very easy to transfer files between clients and servers both ways. Remember that the download alone won't cut it, you'll also need a way to upload your backup for restores later. If you have another server on the Internet, use the Linux sftp to transfer files directly between servers. It'll be much master because of the high bandwidth between servers on the net.