iTunes can’t backup my iPhone 3GS! (Solved)

Where's the Back Up option?
So I was thinking of downgrading my iPhone so that I could re-upgrade with a jailbroken firmware. When I wanted to create a backup to restore to after the jailbreak, I got a surprise! I had no backups in iTunes and the option to create new ones was completely gone. I searched Google and after a good hour of finding the right keywords, I would a fix. If you find yourself stranded, quit iTunes, open Terminal and type this in without the quotation marks: “defaults write com.apple.iTunes DeviceBackupsDisabled -bool false”
Reopen iTunes and like magic, you’ll find the option magically available! I hope this helps all of you looking for an answer!

I agree with your conclusions and looking forward to your coming updates. Thanks for sharing.
earbuds for running