Thank you for your answer but I have got a more detailed solution by pm.
-copy raw and map_source folder (with copy I mean backup on a external harddisk or something like that)
-copy your map from root/mods/yourmap (for the scripts etc)
-copy gdt and files use with the gdt
(text...

I'm currently running windows 7 64 bit, and will very soon upgrade to windows 8.1.  What do I need to backup so I don't lose all my custom textures, models, maps etc.?

I know I said the release date was very soon, but I had some problems with the elevator and lack of motivation. But the elevator is almost done, probably making a custom hud and I will update the BO perks.
So... here's a picture of a zombie slayer wearing a Hat and a zombie sliding in front of...

You could open the prefab in radiant and remove the machine model, then in your map add the machine model yourself. It worked for me.

Love the plane!!! Keep up good work.

Thanks u too with yours.

it looks pretty cool man, looking forward to it, and can i ask, why no Mule Kick? i find that to be the one of the most useful BO1 perks

I  think it is too easy to have 3 weapons. It does...