De aqui :
Backing up your iPhone or iPod touch
Your iPhone and/or iPod touch is
backed up by iTunes each time you:
- Sync with iTunes (automatically on the first sync, every time you
connect it to the computer)
- Update in iTunes (occurs automatically without prompting)
- Restore in iTunes (prompts you to create a backup before the restore
process begins)
Although iTunes backs up most of your
iPhone and iPod touch settings,
downloaded applications, your audio,
video, and photo content are not
included in the backup.
If restoring from an iTunes backup,
your iPhone and iPod touch settings,
downloaded applications, audio, video,
and photo contents will re-sync to the
device because the "Sync" option under
the respective tabs will be checked in
iTunes when restoring from a backup.
If you choose to restore your device
as a new user, downloaded
applications, audio, video, and photo
content will not be sync until you
select the "Sync" option in iTunes
under each tab.
Restoring your iPhone or iPod touch
Using the Restore function for your
iPhone or iPod touch is part of
standard troubleshooting procedure.
Restoring your device will erase all
data from your iPhone or iPod touch,
including songs, videos, contacts,
photos, calendar information, and any
other data. All iPhone or iPod touch
settings are restored to their factory
condition.
Whenever you restore your iPhone or
iPod touch, Apple highly recommends
that you perform a sync prior to
restoring in order to back up any
changes since your last sync. If you
have movie rentals on the device, see
this document before restoring.
Use the following steps to restore
your iPhone or iPod touch:
- Make sure you have the latest version of iTunes installed and
running before attempting to update.
- Connect your iPhone or iPod touch to your computer.
- Select your iPhone or iPod touch when it appears in iTunes under
Devices.
- Select the Summary tab.
- Select the Restore option.
- When prompted to back up your iPhone or iPod touch's settings before
restoring, select the Back Up option. If have
just backed up the device, it is not
necessary to create another.
- Select the Restore option when iTunes prompts you (As long as you've
backed up your device, you should not
have to worry about restoring your
phone).
-
Once the restore process has completed the iPhone or iPod touch
restarts and displays the Apple logo
while starting up.
iPhone only: For the iPhone only, after a restore, the iPhone
displays the "Connect to iTunes"
screen. Keep your device connected
until the "Connect to iTunes" screen
goes away or you see "iPhone is
activated." If iTunes does not have an
Internet connection, you cannot
complete this step.
- The final step is to restore your iPhone or iPod touch from a
previous backup.
Select the back up you want for your iPhone or iPod touch and select
the Continue button in order to
complete your device's restoration.