Back up

From Software Wiki

iTunes will back up the following information 
App Store Application data (except the Application itself, its tmp and Caches folder).
Application settings, preferences, and data.
Autofill for webpages.
CalDAV and subscribed calendar accounts.
Calendar accounts.
Calendar events.
Call history.
Camera Roll (Photos, screenshots, images saved, and videos taken. Videos greater than 2 GB are backed up with iOS 4.0 and later.)
Note:
For devices without a camera, Camera Roll is called Saved Photos.
 In-app purchases.
 Keychain (this includes email account passwords, Wi-Fi passwords, and passwords you enter into websites and some other applications. If you encrypt the backup with iOS 4 and later, the keychain information is transferred to the new device. With an unencrypted backup, the keychain can only be restored to the same iPhone or iPod touch. If you are restoring to a new device with an unencrypted backup, you will need to enter these passwords again.)
 List of External Sync Sources (Mobile Me, Exchange ActiveSync).
 Location service preferences for apps and websites you have allowed to use your location.
 Mail accounts.
 Managed Configurations/Profiles. When restoring a backup to a different device, all settings related to the configuration profiles will not be restored (accounts, restrictions, or anything else that can be specified through a configuration profile). Note that accounts and settings that are not associated with a configuration profile will still be restored.
 Map bookmarks, recent searches, and the current location displayed in Maps.
 Microsoft Exchange account configurations.
 Network settings (saved wifi spots, VPN settings, network preferences).
 Nike + iPod saved workouts and settings.
 Notes.
 Offline web application cache/database.
 Paired Bluetooth devices (which can only be used if restored to the same phone that did the backup).
 Safari bookmarks, cookies, history, offline data, and currently open pages.
 Saved suggestion corrections (these are saved automatically as you reject suggested corrections).
 SMS and MMS (pictures and video) messages.
 Trusted hosts that have certificates that cannot be verified.
 Voice memos.
 Voicemail token (This is not the Voicemail password, but is used for validation when connecting. This is only restored to a phone with the same phone number on the SIM card).
 Wallpapers.
 Web clips.
 YouTube bookmarks and history

Contents 1 Encrypted backups 2 Where backups are stored 3 Creating a Backup 4 Restoring from a Backup 5 Deleting a Backup

Encrypted backups

In the iTunes Summary screen, select "Encrypt iPhone backup" if you want to encrypt the information stored on your computer when iTunes makes a backup. Encrypted backups are indicated by a padlock icon (as visible below in the Deleting a Backup section), and a password is required to restore the information to iPhone. You may want to write down the password for your backup and store it in a safe place. If you use a Mac, when you set a password you can select to store the password in the keychain. With iOS 4 and later, you can transfer your keychain backup to a new device if you encrypt the backup.
Warning: If you encrypt an iPhone backup in iTunes and then forget your password, you will not be able to restore from backup and your data will be unrecoverable. If you forget the password you can continue to do backups and use the device, however you will not be able to restore the encrypted backup to any device without the password. You do not need to enter the password for your backup each time you back up or sync.
If you cannot remember the password and want to start again, you will have to do a full software restore and when prompted by iTunes to select the backup to restore from, choose Set up as a new device.

Where backups are stored

The folder where your backup data is stored changes depending on the computer's operating system. Since iTunes only keeps one backup per device, you should ensure the backup folder is included in your periodic data backup routine.
iTunes places the backup files in the following places:
 Mac: ~/Library/Application Support/MobileSync/Backup/
 Windows XP: \Documents and Settings\(username)\Application Data\Apple Computer\MobileSync\Backup\
 Windows Vista and Windows 7: \Users\(username)\AppData\Roaming\Apple Computer\MobileSync\Backup\

Creating a Backup

Backups can be created in the following ways :
 If you have configured your iPhone or iPod touch to automatically sync with iTunes on a specific computer, iTunes will back up the iPhone or iPod touch after you connect it to that computer and sync with iTunes. iTunes will not automatically back up an iPhone or iPod touch that is not configured to sync with that computer. iTunes only makes one backup each time you connect, even if you sync multiple times before disconnecting.
 If you do not have your iPhone or iPod touch sync automatically when connected, iTunes will create a backup when you choose to sync.
 Right-click (or Control-click) the iPhone or iPod touch in iTunes under Devices and choose Back Up.
 If you choose to update the software, iTunes will back up the iPhone and iPod touch automatically.
 If you choose to restore the software to factory settings, iTunes will ask you if you want to back up the iPhone and iPod touch.  After restoring your iPhone or iPod touch software to factory settings iTunes will provide a Set Up Your iPhone / iPod touch screen. If you choose to "Restore from the backup of" iTunes makes a copy of the backup you chose to restore from and that copy is marked in the syncing preferences of iTunes with the data and time when the backup was created.

Restoring from a Backup

To restore information from a backup use one of the following methods after connecting your iPhone or iPod touch to the computer you normally sync with:
 In iTunes, select the device, then select the Summary tab and click Restore (this deletes all data on iPhone and restores to factory settings). When prompted by iTunes, select the option to restore your settings.
or  Right-click (or Control-click) the device, and choose Restore from Backup.
Remember:
 If you choose to set up as a new iPhone or iPod, first back up any important backups of that device you want to retain from the backup folders listed above. iTunes only retains one sync-generated backup per device, and the first sync after setting up as new will replace your previous backup. If you change your mind and want to restore to your previous state, you will have to do so from a backup that you have retained through your periodic backup routine. If you have Mac OS 10.5.5 or later and use Time Machine, Time Machine may back up your backup. Copies of a backup marked with a date and time stamp created by selecting to "Restore from the back up of" are retained by iTunes and not overwritten. For an example of a backup with the date and time stamp in the device name, see the picture below in the Deleting a Backup section.

Deleting a Backup

If you want to delete a backup created by iTunes, follow these steps in iTunes 7.5 or later:

1.Open iTunes Preferences:
Windows: Choose Edit > Preferences.
Mac: Choose iTunes > Preferences.
2.Click Devices (iPhone or iPod touch does not need to be connected).
3.iTunes 8.1 or later will show the phone number, IMEI, and serial number of the backed up iPhone when you position your mouse pointer over a backup (serial number only for iPod touch). Use this to locate the backup for the iPhone you want to delete. Select the backup you want to remove and click Delete Backup.

4.Confirm you wish to remove the selected backup by clicking Delete Backup.
5.Click OK to close the iTunes Preferences Window.
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