I have lost recovery disc. If a create a back Up Disc is that the same thing ?

No, a backup disc and a recovery disc are not the same thing. A backup disc can be various things. It can be a disc containing only your personal files for example, but it may also be an image of your entire hard drive. In this last case, if you would restore your computer from this backup disc in one week from now, you would end up with a computer being the same way it is today, when you made the backup disc. A recovery disc restores your computer back to factory settings, the way your computer was when you unpacked it. Before restoring a backup or performing a recovery of your computer, make sure to backup your personal files which you currently have, as you will lose these otherwise.

No,

The back-up and recovery disc are the same no difference at all so you should install another cd for it if you ever forget your password if your not the admin you need to type theire password in if your one and a few others you just click confirm straight away and if your admin you just need to do that

The other cd will go off your computer when you install another

it will do the job yes