I generally vid all trades, and keep the vid until the transaction has been vouched for or a long period of time has passed. I have a 750gb hard drive that is mostly unused, so the vid space isn't much of an issue to me.
nope, i find it easier to take screenshots i use a tool call snapper and it saves them automatically in a folder on my computer so its very handy and easy
I take a picture of the finished product (the fire cape in my case). i do not upload it unless the guy posts a scam report or something in which case i'll flash the pic to prove innocence.