I had read that I can mark folders with \"do not backup\" attribute with ios 5.1 and later
As i understand, in such case all contents of directory will be excluded f
First, post this on the internal Apple forums and see if you can get an Apple engineer to respond, which I doubt. Problem is even if it works today it may break later.
Suggestions:
1) create a folder in Documents, mark it, then only store files in it.
2) add a method to your app delegate that takes a file name parameter, then when called locates the file and marks it. In this case you need to insure you call it after every file creation action.