Hi all I've recently start using Time Machine with an external hard drive. Now however every time I start my laptop, it comes out of standby or after a certain amount of time, I get a popup saying: "the identity of the backupdisk 'MAC' has changed since the last backup. the disk is possibly replaced or erased..." Underneath there are two buttons "use this disk" and "no backup" This is quite annoying and was wondering how I can disable this? Thanks! PS: I don't know if "backup" is the correct English term as my laptop uses a different language.