Hi.. I have an iMac with 1TB, so I have a external portable 1TB drive attached to it for time machine. Today, it said, backup failed. So, I just checked the info and it showed me 30GB remaining, that means I have to delete some old backups, which Time Machine does himself. But Im not sure, why it dint ? What can be the reason ? So, can anyone let me know, how to delete the old backups , as the command+del is not working for them.