Does Time machine keep any old backups? I'm using a MacBook with Snow Leopard backing up to a 1TB HDD whick is already full so I think new backups are replacing older. I want to free a lot of space on the internal HDD but don't want to lose the old files. I notice there is a back up from near the time I started. Will this remain permanently as intermediate backups are replaced by newer or will it too disappear in time? What is the system, please? Many thanks indeed, groper.