Surprised that it worked without backup anything

I decided to do the unthethered jailbreaking on my iPad 64Gb 3G last night after seeing so many success story posted on Engadget about using GreenPoison RC5 to jailbreak iOS 4.2.1,  I've been holding back all the way until now, and was very excited to report that the result is fantastic. 

Here's my step:
- Download greenpois0n.app for Mac.  I downloaded a few shitty version and they were ... well .. shitty.  Finally downloaded one that works.
- Run greenpois0n.app and following the on screen instruction.  I tried to follow the timing as close as possible, but for the first 3 to 4 times I kept stuck in the black screen on iPad with "something somehting failed to load, greenposion initialized".  I found out that in the beginning the iPad needs to be still on, and then use the instruction step's timing to keep the whole process in pace.  I also tend to hold the home button a bit longer on the last step.  Eventually the jailbreak script on the iPad got kicked off, and finally I got a jailbroken iPad 4.2.1,  I even tried an appz and found it ran OK.
- Run redsnow 0.9.6b4 to ONLY install Cydia (just check that one check box).  Just like most people said.  The Loader app didn't work.  After the same reboot process (see the big pineapple on the screen), Cydia was installed (first with no icon, but got the icon back after the in-app update).

That basically it.  Just keep tried and eventually you hit to right timing to kick off the restore disk mode and iPad jailbreak code will work after then.

Some tidbit:

• I did not do any special backup on my iPad.  All I did was making sure that I had copies on all the original draw I made on the iPad, and made a copy of backups from AppBackUp folder.  I applied iOS 4.2.1 official firmware on the iPad, and found that no app (authetic and appz) was deleted.  Sure all apps installed thru Cydia were gone, but since they are system level apps, I actually perfer reinstalling.  Seeing everything I've been using (video, eBook, ....) are still there on the iPad give me a fantastic feeling.  
• All music and video that sync with iTune are a bit messed, but since I don't care, I just them all over again.  No big deal.
• The Chinese handwriting provided by Apple is actually pretty good.  So I may not get iAcces right away even though I paid for it.