Prevent app from backing up documents folder?

Question

I\'m trying to prevent my app backing up files to iCloud but have become completely confused and a little lost.

-EDIT-

I\'ve updated this to reflect the chan

Answer 1

- (BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)URL
{

    assert([[NSFileManager defaultManager] fileExistsAtPath: [URL path]]);

    NSError *error = nil;
    BOOL success = [URL setResourceValue: [NSNumber numberWithBool: YES]
                                  forKey: NSURLIsExcludedFromBackupKey error: &error];
    if(!success){
        NSLog(@"Error excluding %@ from backup %@", [URL lastPathComponent], error);
    }
    return success;
}

NSURL *documentURLWithExtension = [documentURL URLByAppendingPathExtension:extensionType];

pass this "documentURLWithExtension" to this function

[self addSkipBackupAttributeToItemAtURL:documentURLWithExtension];