How do I backup my jailbroken iPhone 3g 2.1 data?

[Mortagon]

I just jailbroke my iPhone for the first time using QuickPwn to get jailbreak 2.1. Everything worked great, I was grabbing some stuff off of Cydia, all was well and I loved it. Then I restarted my iPhone after installing a bunch of apps, and I got stuck on the never-ending apple logo. After I tried restoring a backup I made with iTunes off my jailbroken iPhone, I would never be able to start the iPhone up again. For whatever reason, data could be copied to the iPhone while still on the never-ending apple loading screen, but I would never go back to the home screen. After two more attempted restores of the backup of the jailbroken iPhone, I gave up and went back to the official 2.1 firmware.

Now I am about to jailbreak again, but how do I make a backup of my jailbroken iPhone that I can actually restore from successfully? Is there any way to?

 

[fireshot91]

wow, this is the same stuff that I'm having problems with right now!!! my iPhone is in the apple logo screen, and it's not going away! I don't know what to do! my iTunes/Windows PC does recognize that the iPhone is plugged in. anybody know what to do?

 

[Mortagon]

So I found out why my iPhone froze up before, I was using an older iPhone MobileInstallation modded file instead of the 2.1 one, which caused my iPhone to not start up again.

 

[Enigmafan420]

So I found out why my iPhone froze up before, I was using an older iPhone MobileInstallation modded file instead of the 2.1 one, which caused my iPhone to not start up again.

I was going to mention that, but your original question is a good one...

I would like to save my jailbroke installs and then restore 2.1 and qwkpwn again. Is this even possible? (saving the 3rd party apps and preferences?)

 

[ntrigue]

aptBackup on Cydia

 

[Mortagon]

How about AppBackup? That seems the best from the Cydnia descriptions