Enes Erdin's Blog

These were for my iPhone 3G running OS 3.1.3

How to backup Contacts :

Navigate to /private/var/mobile/Library/AddressBook
There will be two files save them on your computer.

How to backup Messages :

Navigate to /private/var/mobile/Library/SMS
Save sms.db on your computer

How to backup Calendar:

Navigate to /private/var/mobile/Library/Calendar
Copy Calendar.sqlitedb to your computer

How to backup Notes:

Navigate to /private/var/mobile/Library/Notes
Copy notes.db and notes.idx to your computer

How to backup your Call History:

Navigate to /var/mobile/Library/CallHistory/
copy call_history.db to your computer

Photos : 

var/mobile/media/DCIM