I installed iOS 5 on my wife's iPhone 3GS about 3 weeks ago. When the process was over, she was missing her apps. I reinstalled these from the App Store via the Purchased section. However, she was missing data from her apps. At the time, it didn't seem like a big deal, because her emails were still on the server. Over the past few weeks, however, it has become more of a pain, from the trivial (lost Angry Bird levels) to the more major (lost appointments).
So, if I was to connect the iPhone up to the computer from which iOS 5 was installed, I'm thinking I could restore the data. However, I'm afraid that if I did so it would erase any data accumulated over the past 3 weeks.
So I have two questions
a) If I restore data on the iPhone from a few weeks ago, will it indeed erase data that has been accumulated since then? Is there a way to merge data?
b) Is there a way to restore data for only particular apps?
The end goal is to somehow retrieve all the data from before the iOS 5 updateand the data since the update.
Best Answer
The sad and short answer is No.
However, the long answer is maybe.
First, make a list of the programs where you do want to attempt to merge or replace her data. You will need to rename the current device so the backup is saved, then restore the device to get at the old data. At that point you can extract the "old" data to a computer. Then you would restore the "new" backup and merge the data back for each case where you could get it onto a computer.
You can see how this is tedious, prone to error, and requires you to learn the specifics of each app where you want to get your data. All great things to know, but you have to balance it against the time it would take you to simple re-create the data in the first place.
This also serves as the perfect use case for iCloud backup. In this case, you would never have not restored the backup since the cloud is so much more accessible than a computer and a USB cable.
I would say - once you have a list of the apps you want to "pick" - come back and ask that single question - how can I access the saved game levels for game X and people here will step up if it's an easy google search or they know how to get that one file off the device.