Is network reachability important in my app

Question

i have develop an app that save its data as backup on a remote server. so i just use connection delegate methods to check if i receive a response or not. so i want to ask if my app will be get rejected for not checking connection like in Reachability code.

-(void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response 

-(void) connection:(NSURLConnection *) connection   didFailWithError:(NSError *) error 

and one thing more is that if i use Reachability code then should i only check my remoter server is available. means no need to check is it by wifi or someother.