Just a heads-up. If you're running straight off the board to just a stereo device, the FOH mix will most likely NOT sound like what you need to go to tape (shut up... I still call it tape lol).
What I've seen done in the past, depending on your setup, is if you have a free aux send, use it as your output to your recording device, and then you can use that aux send on each channel to have abetter mix going to your device.
If your board has montor sends, you can do that instead, but it's the same thing, basically.
You just need to be able to adjust the levels independently of the house mix.
It's very rare that you can pull straight from the mix and sound good (unless everyone is playing direct, with no stage-volume-producing amps, etc).