This method should be implemented in a NSURL category

Prevent iCloud Backup

- (BOOL)addSkipBackupAttribute{

    if (![[NSFileManager defaultManager] fileExistsAtPath:[self path]]) return NO;
    NSError *error = nil;
    BOOL success = [self setResourceValue:[NSNumber numberWithBool:YES] forKey:NSURLIsExcludedFromBackupKey error:&error];
    if(!success){
        NSLog(@"Error excluding %@ from backup %@", [self lastPathComponent], error);
    }
    return success;
}