I have a Mac Mini with a 40GB system drive and the time has come to move all the user data to an external drive, as I only have 750MB left.
So I plugged in a 1TB firewire drive and used Finder to copy the files across. This failed though as the system drive ran out of space in moments. Upon re-boot the space reappeared so I tried again, this time with rsync. The same problem occurred moments into the copy job.
I have two questions; What is causing the drive to fill (I assume some kind of caching) and how can I avoid it?