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BananaExpress! You have piled up some questions without being absolutely clear, so I'll try to answer.
You will have to format the partition completely inorder to move to Windows 8. Note that i said "Partition" and not "drive". Most of the time people have a separate partition where they install only Windows and its softwares.
Whats the situation on your end?
Whats the total size of your drive and how many partitions do you have?
Whats the size of your C: Drive?
You are messing with the registries so is it safe for me to assume you are an "Advanced" user?
What exactly do you mean "All your registries"? You shouldn't Restore ALL your registries on Windows 8, except only for those programs which you
use and
have installed them in Windows 8. For instance, if you have backed up Steam's reg keys, then first Install Steam in Windows 8 and
then restore the registries.
Restoring the registries for Windows' Programs (from Win7) can mess up your Windows 8 so only take backup of 3rd Party Software's registries.
Really? 180 Threads and you still ask that question?
There is no noticeable difference. The OS itself however, utilizes your RAM more efficiently so the bottom line is, it does much better than Windows 7. Overall performance in Gaming however, remains the same. (Real world analysis)
If you have a separate partition for Windows (like I explained above in 2nd Para) then you don't need to worry about the data in other partitions (like D, E or F etc).
Make a bootable USB (i am sure you know how to do that) and install windows from it. During installation it'll ask you to choose the partition where you want to install it, from where you can choose the drive you have assigned specifically for Windows ... say, C: drive.
By Windows Restore, i assume you are talking about
System Restore? Because thats something completely different.
All in all, you can't restore anything, other than a few registry entries for some programs like Steam, Origin etc. You'll have to install software from scratch.
If you are concerned about things like a Web Browser's cache, extensions or history etc then it can be backed up (the ones which support it) but its Manual Process and i don't know if you really are an Advanced User who understands this stuff.
Rather vague question. Can you explain this more? What kind of protection are you looking for?