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    <p>You set the skip back attribute to the file before coping it, since the file is not yet copied there the filemanager can't change the properties of that file:</p> <p>Also you are not calling the <code>addSkipBackupAttributeToItemAtURL:</code> on self but on <code>NSFileManager</code> which does have this method declared.</p> <p>You can <code>addSkipBackupAttributeToItemAtURL:</code> from a class method if you declared it as an instance methods, change it to <code>+</code> to make it a class method.</p> <p>Change it to something like:</p> <pre><code>+ (BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)URL { if (&amp;NSURLIsExcludedFromBackupKey == nil) { // iOS &lt;= 5.0.1 const char* filePath = [[URL path] fileSystemRepresentation]; const char* attrName = "com.apple.MobileBackup"; u_int8_t attrValue = 1; int result = setxattr(filePath, attrName, &amp;attrValue, sizeof(attrValue), 0, 0); return result == 0; } else { // iOS &gt;= 5.1 NSError *error = nil; [URL setResourceValue:[NSNumber numberWithBool:YES] forKey:NSURLIsExcludedFromBackupKey error:&amp;error]; return error == nil; } } + (void)copyDatabaseIfNeeded { NSFileManager *fileManager = [NSFileManager defaultManager]; NSError *error = nil; NSString *toPath = [self getDBPath]; BOOL success = [fileManager fileExistsAtPath:toPath]; if(!success) { NSString *fromPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:databaseName]; NSURL *toURL = [NSURL fileURLWithPath:toPath]; NSURL *fromURL = [NSURL fileURLWithPath:fromPath]; success = [fileManager copyItemAtURL:fromURL toURL:toURL error:&amp;error]; if (success) { [self addSkipBackupAttributeToItemAtURL:toURL]; } else { NSLog(@"Failed to create writable database file with message '%@'.", [error localizedDescription]); } } } </code></pre> <hr> <p>Also a my comment stated I removed the <code>[[NSFileManager defaultManager] addSkipBackupAttributeToItemAtURL:fromURL];</code> since that file will a not be included in an iCloud backup and b files in the bundle are readonly and can't there for be modified.</p>
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