Okay, I don't think _anyone_ is talking about saving the entire system state every minute...at least I hope not. I thought he just meant all apps saving their info every minute, which is a vastly simpler task. Clay >The first thing that comes to my mind is that this is something of an apples to >oranges comparison. :-) Memory was a lot smaller back then (64k on the >C64 where Geos came from). And while, yes, disks were smaller and slower, >memory usage has risen by many orders of magnitude, while disk speed only by >1 or a few (depends on if you compare floppies to hard drives or hd<-->hd).