Question: what if I accidentally uninstalled BookZ, lost my library and the iTunes backup has already been overwritten (so that restoring is not an option)?
In Mac OS X 10.5.5, iPhone/iPod Touch is backed up by iTunes and iTunes is in turn backed up by time machine. Therefore, it is possible to restore an iPhone/iPod Touch to any backup in the past with the help of Time Machine.
The backup files for iPod is located at ~/Library/Application Support/MobileSync/Backup
Please follow this tutorial to restore the iPhone/iPod to an older state from Time Machine
0. Perform a Time Machine backup
1. Check if the iPhone/iPod is backed up by Time Machine. By default, it is automatically backed up in OS X 10.5.5
Go to Finder, navigate to ~/Library/Application Support/MobileSync/Backup
Power up Time Machine and see if there are older backups on the right
If you are able to see something like Today at XX:XX, Yesterday at XX:XX, you have your iPod backed up! Otherwise stop here–there’s no backup and restoring is not possible.
2. Sync your current iPhone/iPod. Perform a full backup of the iPhone/iPod.
3. Under the same folder in STEP 1, there are a lot of random folders and one of them is your iPhone/iPod’s backup.
To identify which is which, go into a folder,
Look for Info.plist by typing i-n-f-o and Finder will highlight the file
Open in TextEdit/Quick Look and you’ll see something like this:
If the “Device Name” and “Display Name” is the same as displayed in iTunes, bingo! Otherwise, repeat STEP 3 for a different folder
4. When you find the folder you are looking for, drag the folder to your Desktop just in case. (You may delete it after successfully performing the last step of the tutorial)
5. Restore the iPod to factory settings
6. Quit iTunes
7. Go to Finder
Enter Time Machine
Select an older version of the backup folder
and restore–replace current version!
Tip: Unsure which folder to restore? Use “Quick Look” to identify “info.plist” just like in STEP 3
8. In iTunes, “Restore from Backup” and select the appropriate backup with the same name as your iPhone/iPod
After the process you should have a clean iPhone OS installation with all old settings and apps in tact.