Itunes on an external drive?

I want to backup all my apps on my iPhone but have less than 1 gig left on my C drive,
I know I would need to install iTunes onto my C drive but then Can I get iTunes to backup my iPhone to an external drive that I have loads of room on

Installing the program on a different drive isn't going to help you at all. Just change the media folder location (where the music etc.files are stored) to the external drive in iTunes > settings/preferences > advanced. You're also gona want to make sure the two check boxes underneath are ticked.

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