If you just unlocked your iPhone using the SAM method Redsn0w 0.9.10b8 adds the ability to backup arbitrary directories or files from your device into a zip file on your Mac or PC.  The new button is Extras->Even More->Backup and it requires your device to be jailbroken with the afc2 service enabled (most jailbreaks include that).  By default it will backup your activation records from /var/root/Library/Lockdown

Make sure you backup your activation records so that you can stay unlocked even if Apple patches the loop hole.