I just did a SuperDuper backup of my system drive. It backed up fine at about 308gb. I checked the backup by booting from it, then rebooted and spent the day working on my system. I was trashing a few files and just noticed that the finder indicates that my system is using up nearly 545gb. I ran Baseline and what's weird is that Baseline finds these values (system, 4gb; applications, 14gb; library, 20gb; users, 230gb ; plus other misc files -- for a total of 270gb) but also shows that the amount of space the system disk is taking up is also 545gb. Where is this hidden space being taken up? It looks like the actual files on the disk are being doubled and read as twice their true values. Anyone ever have a problem like this?