iOS "Do not backup"

NSFileManager+DoNotBackUp.h

//
//  NSFileManager+DoNotBackUp.h
//
//  Created by Morten Heiberg on 29/05/12.
//  Copyright (c) 2012 Strange Loop. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface NSFileManager (DoNotBackUp)

+ (void)addDoNotBackUpAttributeToPath:(NSString*)path;
+ (void)addDoNotBackUpAttributeToURL:(NSURL*)url;

@end

NSFileManager+DoNotBackUp.m

//
//  NSFileManager+DoNotBackUp.m
//
//  Created by Morten Heiberg on 29/05/12.
//  Copyright (c) 2012 Strange Loop. All rights reserved.
//

#import "NSFileManager+DoNotBackUp.h"
#include <sys/xattr.h>

@implementation NSFileManager (DoNotBackUp)

+ (void)addDoNotBackUpAttributeToPath:(NSString*)path
{
    u_int8_t b = 1;
    setxattr([path fileSystemRepresentation], "com.apple.MobileBackup", &b, 1, 0, 0);
}

+ (void)addDoNotBackUpAttributeToURL:(NSURL*)url
{
    [NSFileManager addDoNotBackUpAttributeToPath:url.path];
}

@end