How do you make/record a battle video?

I have seen people posting battles online occasionally. How do you record a battle for later viewing?

When we use the "b" observe function are the files that we view downloaded to a folder that we can copy?

Bottomline - I would like to preserve our guilds last gvg battle for later viewing. How do I do that before it removes itself from the observe page?

ps: tried search function - said i didn't have permission to search

I don't think there's a video recording function included in GW. However, there are programs like FRAPPS that allow you to record videos from any games you play.

My recommendation - Game Cam. It's a quick download, and won't slow your game down to the point where it's unplayable. It won't be like observer mode, in that you can only follow the person who's actually recording the game, but if you get everyone to use it, you'll at least be able to see the battle from your teams perspective (and, if you go into observer mode, you'll be able to record that, too)
www.planetgamecam.com

fraps, hypercam, gamecam, or the good old 300$ HD capture card.