So if my hard drive with a free Windows 10 operating system on it fails do I have to buy Windows 10 or will all be well with putting an earlier backup or backup image on the new hard drive? Or should I clone my disk before it's failure to a new disk? I have never needed to use a backup before, but now seems like a good time to understand the options and make one. I just installed the free Windows 10 upgrade and I'm looking over my backuppers offered options, then I realised I'm not really sure how the Windows 10 licence upgrade works. I don't see a key, it just says windows is activated. If I click change product key does it show a key [or does it irrevocably cancel the current key and laugh]? So yeah, anybody who has got a few minutes to give me some advice it would be much appreciated. Thanks!