"With my photos all on the external drive, I have almost 100GB of free space. " Of course, there is another external drive which is kept syncronised with the l

"With my photos all on the external drive, I have almost 100GB of free space. " Of course, there is another external drive which is kept syncronised with the laptop and the iPhoto drive using automatic backup software, and then a third, much larger, external drive that is a backup - never deleting anything - rather than a sync. I wonder how many photos the original author takes a month? How long is that 100Gb going to last? Fully agree with the processor/RAM comments!