Don't worry not another noob question.

When i was back on 3.1.2 i had jailbreak with Blackr1an, anyway something happened and i was stuck with phone looping on apple logo and had no way out so i had to upgrade to 3.1.3 not to bad as i had jailbreak it with spirit and again click the "make my life easier" (did this both on 3.1.2 and 3.1.3.

From that i used the command patching thing to patch my phone not to make it a spirit jailbreak and thankfully managed to make a custom firmware and have now a jailbreak iphone 3gs 3gb with ios4

I was just checking on Cydia that my Device had SHSH's on file for 3.1.3, Did i loose 3.1.2 because i had to upgrade to offical 3.1.3 OS and had to click make my life easier again?

Also would it be wise to save iOS4 on my phone, and would it overwrite my current 3.1.3 backup?

Just need to understand to make sure i dont do anything wrong, I have no reason to go back to 3.1.3 but its there just in case.

Cheers guys.