I have been "leaving" quake for some time now (link), I started to do it more than 2 years ago, but i'm still here. There are just a couple of differences with the time back then: I have a more stable aim now and I am not addicted to it any more, I play when I want and don't want it so often. And I just have 3 days to play quake now, Friday, Saturday and Sunday.
Once you stop playing quake you will start to spend same amount of time you spent on playing on visiting the forums or talking to your quake mates . Don't do it .
Ok, and now what you need to copy: 1) all your own configs if you have any, if not then copy q3config.cfg, 2) Mouse settings in windows (make a screenshot of pointeroptions), 3) settings of special programs for your mouse if you have any (for example setpoint)

muahahahhahaa..... they alllllllll come back!! q3 is a disease man.... u can't just quit

gl & take care han.