How do i reformat a case sensitive external hard drive without losing data

I know there are a lot of posts about this, and i have spent hours trying to find a soloution / understand what people have responded to others, but i can't work this out.
I also have a Buffalo HD (let's call it HD1) that stores my itunes library.
I have a WD My Passport for Mac (let's call it HD2) that backs up my Mac Book Pro.
I have an older WD that has older TM back ups on it from previous computers (let's call it HD3)
I have one spare completely 'clean' WD hard drive (let's call it HD4).
My laptop was really slow and full so i went to Genius bar, they sold me the Buffalo HD and they moved my itunes to it and set it up so it now has my itunes. I used this disk to run two TM Backups before i realised the drive was nearly full, so i bought the WD My Passport HD2.
I now use WD My Passprt HD2 for TM.
I want to MOVE the backups on HD1 to My Passport HD2 as there is lots of space on it. I also want to move my itunes library from HD2 as a back up.
But i can't!!!
After reading for hours, apparently this is because my HD1 is case sensitive, journaled. And it needs to be Journaled to work with TM/OSX or something very confusing. I have read lots of threads about re-formatting / partitioning and all things that are way over my head. But the one thing i do understand is if i reformat HD1, it erases the data.
This is NOT an option as it holds my WHOLE itunes. The Itunes is WAY too big to drag onto my mac book pro and then move it over to HD2 and make that my itunes folder.
HOW THE **** ARE YOU SUPPOSED TO BACK UP THE CASE SENSITIVE DRIVE BEFORE REFORMATTING IT IF IT'S TOO BIG TO FIT BACK ON YOUR COMPUTER? Surely that's the whole point of having an external drive... to back up AND give you more space?
I'm so mad that the apple store did this to me... they should know that case sensitve wouldn't work with a passport... that i would have problems. UGh.
I have options to move the files from HD1 as i have HD2 and HD3 and then also the completely unused HD4... but i can't move anything anywhere due to this case sensitive nightmare.
Someone PLEASE HELP ME.
thanks.

Hi Kappy,
Just wondering if you had any advice for my situation . . .
My time machine backup was backing up to a drive that was "Mac OS X Enteded Journaled, Case Sensitive."  I had no idea what this meant, or that it would even cause issues.
I took my computer to the Apple store yesterday, and they wiped it clean.  When they tried to restore it from the Time Machine backup drive, it would not work.  Their guess is that Time Machine cannot restore from a drive that is "case sensitive."
Any thoughts on how I can convert my time machine backup data from a "case sensitive" state, to a "non-case sensitive" state?  I've tried to just drag and drop the files from the case sensitive formatted drive to a new drive that I have that is formatted non case sensitive, but I get the following error message:
"The volume has the wrong case sensitivity for a backup"
I just really want my data back - I thought TimeMachine was the way to go (and was supposed to work) but unfortunately it is not.
Any help you can provide would be greatly appreciated.
Thanks,

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