May I seek some advice please. I have a Mac with Lacie 2tb Ext HDD and all is working well. However, one day the ext HDD will die and will need replacing. What happens with regard to Time Machine ? Obviously I will not be able to access the backups on the Ext HDD. Can I just install a new Ext HDD and backup afresh (as though there had never been a time machine backup)? If not, what do I do. Any help and advice appreciated.