Are the files you save for backup on iPhone 3G through SSH the same files on
iPhone 4?
in other words, can I save the files in this folder:

(like the AddressBook, Calendar, SMS, Voicemail, Mail, Notes, and Safari folders inside this directory).

And use them to get my data back after I erase or update my iPhone 4?
or am I supposed to save different folders on the iPhone 4?

Thank you!