It very easy to replace bookmarks stored your computer in safari or internet explorer to your iPhone but this way iTunes will delete all the bookmarks stored in the safari browser on your iPhone and overwrite with all the bookmarks on your phone.
But what if you want to backup all your safari bookmarks so that you can restore them on your iPhone by syncing next time after firmware upgrade. It was some what different case with me, as I want to backup all the safari bookmarks on my iPhone so that I can restore them back after jail breaking my iPhone 3g.
Lets see how can you backup all your iPhone safari bookmarks on your computer browser including Safari or Internet Explorer