Need some help about Win 8.1 and linux with a dual boot

Hi!
I have a Lenovo z50-70 notebook and I have a Windows 8.1 on it. (The one which was shipped with this notebook...)
My concerns are Intalling Linux as a dual boot and loosing Windows 8.1.
As I am not familiar to Win 8.1, the product key is in the ?BIOS? and there's a lot of partitions...
If I install Linux Ubuntu (latest version) as a dual boot by manually making the partitions, etc. and then if I lose my Windows 8.1 system, how can I get it back?
I've made a backup of the system to the portable hdd but I don't know can I restore it, as I have no win installation disc and I am not sure if i can restore win 8.1 from the backup by using random win 8 installation disc that I've made from the downloaded ISO (for e.g. Win 8.1 pro iso from internet)...
I need a Linux distro for developing my Android ROM but I don't want to lose that Win 8.1 OS from my notebook. So.. What should I do?

Did you do a full disc backup of the C: Drive using a backup tool other than windows? If you did, then the recover of that partition will be up to your backup software.
If worse comes to worse, you can use the novo button to restore your computer to what it was like when it came from the factory. But there really is nothing to worry about. Create your new partition and just make sure that you install Linux to that partition. Make sure it is not the same size as any other partition, that way even if the Linux installer does not show the volume labels, you can tell which partition you want to install Linux in just by the size.
Hoov
Microsoft MVP - Consumer Security
SpywareHammer.com

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