Sync with a new computer - any way to keep app data?

Question

I recently purchased a new computer and imported my itunes library from the old one, but when I attach the iphone (3GS), it doesn't recognise it as the same library and appears to be warning me that all the data in my apps will be deleted. While quite of few of the data ones have backup options, I don't particularly want to lose the data from games where I have unlocked levels... Is there any way to sync the iphone to the "new" library and keep the data within the apps?

Answer 1

By design, the iphone will sync itunes content with one computer at a time. Any attempt to sync such content with a second computer will result in ALL itunes content being first erased from your phone & then replaced with the content from the second computer. This is a design feature and cannot be overridden. Because you replaced your computer, your phone will be wiped of itunes content, but since you restored your library to your new computer, this will not be a problem. App data is stored in two places, on your phone & in your phone's backup. If you restore your phone from backup on your new computer, you will preserve your app data. Follow these instructions in the order specified:
1. Disable auto sync when an ipod/iphone is connected under preferences, in itunes.
2. Make sure you have one contact & one event in whatever programs you use for that purpose on your computer(address Book & ical). The entries can be fake, doesn't matter, the important point is that these programs not be empty.
3. Connect your phone, itunes running, do not sync at this point.
4. Store>Authorize this computer.
5. File>Transfer Purchases(To make sure all purchased content on your phone will be in your itunes library).
6. Right click in the device pane & select reset warnings.
7. Right click again and select backup.
8. Right click again & select restore from backup, select the backup you just made. When prompted to create another backup, decline.
9. This MUST be followed by a sync to restore your itunes content, which you select from the various tabs, You'll get a popup regarding your contacts & calendars asking to merge or replace, select merge.
You should be good to go with all of your app data restored to your phone & you're now syncing to your new computer.