Stupid newbie Titanium Backup question..

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http://androidforums.com – I need to reflash Paranoid Android and I'd like to use Titanium Backup but if I backup to my Gnex built in SD card, isn't that going to get wiped when I install and wipe everything before install? Are the contents of the built in SD card left alone when you wipe a phone or flash a new ROM? If it is wiped, where do I store the backup as the Gnex doesn't have a removable SD card? Sorry if the answer is obvious.. (General)