For example windows 10. Is it more secure to obtain a CD based backup cd or a USB based backup CD as you can probably buy both currently. The thing I'm afraid of, is that the usb data is easily alterable... or is it not? I have huawei modem with some files that I can't modify, but is it a hardware feature of the given usb stick or thats just a simple software trick that can be easily broken by a potential "hacker" or malware?