Where is my iPhone backup kept? (Created prior iOS5 upgrade) I've just updated my wife's 3GS to iOS 5.1 from iOS 4. The restore seem to only restore the messages/photo roll and some other settings. I don't see most of the apps but the most important part is the contacts are missing. This is why I'm looking for the iPhone backup that iTunes creates before updating the software. 

I currently have tried the following:


Turn off iCloud
Turn on then off iCloud
Adding a Contact
Restoring from the last backup file(without timestamp)
Reset to Factory defaults and restoring
Copying from Sim (Has some older contacts, not the recent ones)
Using iBackupBot to browse the backups (only iOS5 backups seem to be there)


Here are some other valid points:
 1. The iPhone isn't regularly synced
 2. I created a backup before updating the OS I can't find it anywhere now
 3. There's no contacts on the Mac's Address Book.
 4. There is only Sim contacts in the iCloud sync
 5. iBackupBot shows me there are no other contacts other than the Sim ones that got synced to iCloud
 6. There are existing SMS-es without Contact Names
 7. I can try to correlate the SMSes with names but it will not give me the full contact list.

Since the Messages are restored, the contacts must be kept somewhere can anyone help me? I'm pretty sure I just need to find the backup that was created for the Update and somehow grab all the contacts maybe using ibackupbot.
If you are on WinXP - 

C:\Documents and Settings/&lt;user&gt;\Application Data\Apple Computer\MobileSync\Backup


If you are on WinVista/Win7 - 

C:\Users\&lt;user&gt;\AppData\Roaming\Apple Computer\MobileSync\Backup


If you are on MacOS - 

~/Library/Application Support/MobileSync/Backup/


With the above path, if you still can not find the iPhone backup location, you may try an application called "iPhone Backup Unlocker", it will help you recover lost backup for your iPhone.