save ipad battery life

Your iPad automatically grabs new data, such as incoming e-mail. However, the iPad periodically activates apps that don't support iOS's Push feature so that they can go "Fetch" new data – which uses your iPad's battery life. You can tweak your Push and Fetch settings in "Settings > Mail, Contacts, Calendars > Fetch New Data".

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iOS 5′s killer feature.

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ipad backup

If you want to keep your sensitive iPad data away from nosy people then encrypt your iPad's backup data in iTunes. Just open the iPad in iTunes, click the Summary tab, and check "Encrypt iPad backup" under the Options heading. 
 
Please note: if you encrypt your data and forget the password, you will not be able to, according to Apple, “restore from backup", and your data will most likely be unrecoverable.