Actually, It doesnt. 'Cause its the purpose of backing up the data. After the update, Your iphone will restore then it will put back your old data.
Yes there are many Apps out there ex: Find My iPhone and also if you have iCloud account setup you can remotely erase the data from lost/stolen iPhones
All you have todo is attach the iPhone to your computer insure iTunes is open and then select restore to factory settings options, which will reset the handset and erase ALL previous data.
No it won't, but if there are any changes to be made, like in ios 4, you could put newsstand in a folder, and when you update it, newsstand just pops out. But is will not cause you to lose any data.
An IPSW file contains data used by iTunes to restore and update the iPhone and iPod Touch software.
iTunes cannot help you do this. But FonePaw iOS Transfer allows you to sync/transfer/copy files from iPhone to iPhone, iPhone to iPad, iPad to iPad, iPhone to iPod etc.If you want to transfer data or files from one iPhone to another one, you can use tools like AnyTrans to make it. It won't erase the previous data on your devices. With it, you can also transfer purchased and non-purchased items from iPhone to computer, to iTunes.
only to download or update the game... playing of the game does not use data ...just a little memory.... (ha ha)
Technically, yes. However your ISP (Internet Service Provider) may charge you for the data used by downloading the software update. The update itself, however, is free.
Yes, I would. While it's loading hold down ALL the buttons (except start and select) at the same time. That'll clear the data.
If you update your iPhone/iPod, you will remove the jailbreak, then you would have to wait until the jailbreaking websites invent a jailbreak for the new ios, but why update if you jailbroke it?
No DVD ripper will erase data from a DVD.
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If you want to format it with out using iTunes then go to setting on your iPhone then to general then to reset then select erase all content and settings it should ask you to enter your pass code then it will make sure with you that you really want to format your iPhone to its original state and after a few minutes your done. Here is a way about how to format iPhone. Settings--->General--->Reset--->Erase All Content and Settings and wait for the iPhone to format itself. Before format your iPhone, you'd better backup your data.