So I just rooted my 2.3.3 evo 4g using revolutionary. I used this tutorial (How to Root Your HTC EVO 4G (with OTA Gingerbread Update)), in case anyone was wondering. From what I read one of the first things you should do is make a nandroid. So i downloaded ROM manager (v188.8.131.52). When I go into the app, the first thing I see is Flash ClockworkMod Recovery. What exactly is this? Is the next step for me to just click on "Backup current ROM"?. I also read some places that I shouldn't use ROM Manager but should backup manually. Does anyone have an opinion about this?